Jun Sugiyama

Comprehensive Research Organization for Science and Society (CROSS) · Neutron Science and Technology Center

(This is an open access paper.) Using an intense negative muon (μ−) source, we have studied the internal magnetic fields in a powder sample of magnesium hydride (MgH2). By extracting the signal from the μ− captured on Mg nuclei, we found that the negative muon spin rotation and relaxation (μ−SR) spectra clearly showed a Kubo-Toyabe-type relaxation,...

[This is an open access paper.] In order to study the mechanism determining the desorption temperature (Td) of hydrogen storage materials, we have measured positive muon spin rotation and relaxation (μ⁺SR) in MgH2 over a wide temperature range including its Td. The pressure in the sample cell due to desorbed H2 was measured in parallel with the μ⁺...

(This is an open access paper. Go to https://doi.org/10.1103/PhysRevResearch.2.033161) Positive- and negative-muon spin rotation and relaxation (µ±SR) was first used to investigate fluctuations of nuclear magnetic fields in an olivine-type battery material, LiMnPO4 , in order to clarify the diffusive species, namely, to distinguish between a µ+ hop...

The magnetic nature of a quasi-one-dimensional compound, BaVSe 3 , has been investigated with positive muon spin rotation and relaxation (μ + SR) measurements at ambient and high pressures. At ambient pressure, the μ + SR spectrum recorded under zero external magnetic field exhibited a clear oscillation below the Curie temperature (T C ∼ 41 K) due...

(This is an open access paper.) The self-diffusion coefficient of Li+ ions (D^J_{Li} ) in LixCoO2 has been determined during charge and discharge reactions of a LiCoO2 half-cell using a positive muon spin rotation and relaxation (μ+SR) technique through the observation of the fluctuating nuclear magnetic field at room temperature: specifically, wit...

The present study investigated the magnetic nature of a solid solution system consisting of EuCo2P2 and CaCo2P2 using a muon spin rotation and relaxation (μ+SR) technique, which is sensitive to local magnetic environments. The former compound EuCo2P2 is known to enter an incommensurate helical antiferromagnetic (AF) phase below 66 K with neutrons,...

Hybrid organic–inorganic perovskites (HOIPs) are promising candidates for next‐generation photovoltaic materials. However, there is a debate regarding the impact of interactions between the organic center and the surrounding inorganic cage on the solar cell's high diffusion lengths. It remains unclear whether the diffusion mechanism is consistent a...

In this work we present systematic set of measurements carried out by muon spin rotation/relaxation (μ+SR) and neutron powder diffraction (NPD) on the solid solution Na x Ca 1- x Cr 2 O 4 . This study investigates...

LiCrSe2 constitutes a recent valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets. In this work, we present a comprehensive study of the low temperature nuclear and magnetic structure established in this material. Being subject to a strong magnetoelastic coupling, LiCrSe2 was found to undergo a first order struct...

(This is an open access paper.) In this study, the self-diffusion coefficient of Na+ (DNaJ) in P2-NaxCoO2 was measured during charge and discharge reactions between P2-NaxCoO2 and Na metal electrodes in the electrochemical half-cell using an operando muon spin rotation and relaxation (μ+SR) technique through the observation of a fluctuating nuclear...

The mixed valence Cr ³⁺ /Cr ⁴⁺ compound NaCr 2 O 4 , hosts a plethora of unconventional electronic properties. In the present study, muon spin rotation/relaxation (μ+SR) and high-resolution time-of-flight neutron powder diffraction (NPD) measurements were carried out on high-quality samples to clarify the complex magnetic ground state of this uniqu...

Hard carbon is the most common anode material for Na-ion battery. The structure of the hard carbon and the dynamics of Na-ion in hard carbon were studied with small- and wide-angle neutron scattering and muon spin relaxation technique. The neutron scattering revealed the increase of interlayer distance between graphenes and decrease of the size of...

The internal nuclear magnetic field in a superconducting MgB 2 powder sample was studied with a µ ⁻ SR technique. Although the past µ ⁺ SR study on MgB 2 reported the appearance of a dynamic behavior even below T c due to µ ⁺ diffusion, µ ⁻ SR shows a static behavior in the whole temperature range measured, as expected. The ZF- µ ⁻ SR spectra do no...

In an all solid state Li-ion battery, it is crucial to reduce ionic resistivity at the interface between the electrode and the electrolyte in order to enhance Li ⁺ mobility across the interface. Recent first principles calculations predict the presence of a space-charge layer (SCL) at the interface due to the difference in the Li ⁺ chemical potenti...

In order to study the effect of muonic-Li on the µ ⁻ SR spectrum for Li battery materials, the transverse field (TF) µ ⁻ SR spectra have been measured for natural Li metal and ⁶ Li metal samples in the temperature range between 5 and 300 K. Here, TF denotes the magnetic field perpendicular to the initial µ ⁻ spin polarization. For both samples, the...

The internal magnetic field in a ferromagnetic compound, Y2Co12P7 with TC = 150 K, was studied with μ+SR using a powder sample down to 2 K. The wTF-μ+SR measurements revealed the presence of a sharp magnetic transition at TC = 151 K, and the ZF-μ+SR measurements clarified the formation of static magnetic order below TC. The presence of two muon spi...

LiFePO 4 (LFPO) is an archetypical and well-known cathode material for rechargeable Li-ion batteries. However, its quasi-one-dimensional (Q1D) structure along with the Fe ions, LFPO also displays interesting low-temperature magnetic properties. Our team has previously utilized the muon spin rotation ( µ ⁺ SR) technique to investigate both magnetic...

Rhenium oxides belonging to the family AReO 4 where A is a metal cation, exhibit interesting electronic and magnetic properties. In this study we have utilized the muon spin rotation/relaxation ( µ ⁺ SR) technique to study the magnetic properties of the MgReO 4 compound. To the best of our knowledge, this is the first investigation reported on this...

LiFePO$_4$ (LFPO) is an archetypical and well-known cathode material for rechargeable Li-ion batteries. However, its quasi-one-dimensional (Q1D) structure along with the Fe ions, LFPO also displays interesting low-temperature magnetic properties. Our team has previously utilized the muon spin rotation ($\mu^+$SR) technique to investigate both magne...

Two-dimensional (2D) triangular lattice antiferromagnets (2D-TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2-dimensional transition metal dichalcogenide LiCrTe2, being a 2D-TLA, enriched the range of materials which can p...

The magnetism of double perovskites is a complex phenomenon, determined from intra- or interatomic magnetic moment interactions, and strongly influenced by geometry. We take advantage of the complementary length and timescales of the muon spin rotation, relaxation, and resonance (μ+SR) microscopic technique and bulk ac/dc magnetic susceptibility me...

In this work we present systematic set of measurements carried out by muon spin rotation/relaxation ($\mu^+$SR) and neutron powder diffraction (NPD) on the solid solution Na$_{\rm x}$Ca$_{1- \rm x}$Cr$_2$O$_4$. This study investigates Na-ion dynamics in the quasi-1D (Q1D) diffusion channels created by the honeycomb-like arrangement of CrO$_6$ octah...

The mixed valence Cr compound NaCr$_2$O$_4$, synthesized using a high-pressure technique, offers a unique playground for investigating unconventional physical properties in condensed matter. In the present study, muon spin rotation/relaxation ($\mu^+$SR) and high-resolution neutron powder diffraction (NPD) measurements were carried out to clarify t...

The magnetic properties of the S = 1/2 two-dimensional square-lattice antiferromagnets Sr2NiO3X (X = Cl, F) with the trivalent nickel ions in a low-spin state were studied by magnetic susceptibility, heat capacity, neutron powder diffraction, high-field electron spin resonance (ESR), muon spin rotation and relaxation (μ+SR) measurements, and densit...

The recent synthesis of the chromium selenide compound LiCrSe$_2$ constitutes a valuable addition to the ensemble of two-dimensional triangular lattice antiferromagnets (2D-TLA). In this work we present the very first comprehensive study of the combined low temperature nuclear and magnetic structure established in this material. Details on the conn...

The van der Waals ferromagnet (FM), VI$_3$, was studied by muon spin relaxation ($\mu^+$SR) and first principle calculations based on density functional theory (DFT). Temperature dependent zero field muon spin relaxation ($\mu^+$SR) measurements confirm the onset of long range FM order and the time spectra exhibits clear muon spin precession freque...

Two$-$dimensional (2D) triangular lattices antiferromagnets (2D$-$TLA) often manifest intriguing physical and technological properties, due to the strong interplay between lattice geometry and electronic properties. The recently synthesized 2$-$dimensional transition metal dichalcogenide LiCrTe$_2$, being a 2D$-$TLA, enriched the range of materials...

The magnetic phase diagram of Sr1-xCaxCo2P2 as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance (μ+SR). The weak pressure dependence for the x≠1 compounds suggests that the rich phase diagram of Sr1-xCaxCo2P2 as a function of x at ambient pressure may not solel...

Rhenium oxides belonging to the family $A$ReO$_4$ where $A$ is a metal cation, exhibit interesting electronic and magnetic properties. In this study we have utilized the muon spin rotation/relaxation ($\mu^+$SR) technique to study the magnetic properties of the MgReO$_4$ compound. To the best of our knowledge, this is the first investigation report...

To study an intrinsic self-diffusion coefficient of Li+ (DLiJ) in a battery anode material, spinel Li4Ti5O12, negative and positive muon spin rotation and relaxation (μ±SR) spectra were measured using a powder sample in a temperature range of 100–400 K. The implanted μ+ in this study locates at an interstitial site near the O2– ion to form an O–H l...

Currently, no known material retains its photoinduced metallic conductivity over a long time while also exhibiting repeatable metal-to-insulator recovery. Here, we demonstrate such a highly repeatable photoinduced insulator-to-metal transition in yttrium oxyhydride (YOxHy) epitaxial thin films. The temperature (T) dependence of the electrical resis...

The ferromagnetic (FM) nature of the metallic LaCo 2 P 2 was investigated with the positive muon spin rotation, relaxation and resonance ( μ +SR) technique. Transverse and zero field μ +SR measurements revealed that the compound enters a long range FM ground state at TZFC = 135.00(1) K, consistent with previous studies. Based on the reported FM str...

Muon spin spectroscopy ($\mu^+$SR) is now an established method to measure atomic scale diffusion coefficients of ions in oxides. This is achieved via the ion hopping rate, which causes periodic change in the local magnetic field at the muon site(s). We present here the first systematic study on a single crystalline sample. The highly anisotropic d...

The magnetic phase diagram of Sr$_{1-x}$Ca$_x$Co$_2$P$_2$ as a function of hydrostatic pressure and temperature is investigated by means of high pressure muon spin rotation, relaxation and resonance ($\mu^+$SR). The weak pressure dependence for the $x\neq1$ compounds suggests that the rich phase diagram of Sr$_{1-x}$Ca$_x$Co$_2$P$_2$ as a function...

(This is an open access paper in ACS Physical Chemistry Au.) The diffusive nature of Na+ in Na-inserted hard carbon (CxNa), which is the most common anode material for a Na-ion battery, was studied with a positive muon spin rotation and relaxation (μ+SR) technique in transverse, zero, and longitudinal magnetic fields (TF, ZF, and LF) at temperature...

The magnetic nature of low dimensional compound, CrCl$_3$, was investigated by muon spin rotation, relaxation and resonance ($\mu^+$SR). The $\mu^+$SR measurements revealed three distinct phases as a function of temperature: an antiferromagnetic state (AF) for $T\leq T_{\rm N}=14.32(6)$~K, a ferromagnetic short range ordered state (FM-SRO) for $T_{...

Quantum spin liquid is an elusive state that display strong many-body entanglement with potential applications in future quantum computing. This study reports muon spin relaxation ($\mu^+$SR) measurements on a novel high-pressure synthesized material, the Hollandite K$_{2}$V$_8$O$_{16}$. In this quasi-one-dimensional compound, charge ordering (CO)...

The magnetism of double perovskites is a complex phenomenon, determined from intra- or interatomic magnetic moment interactions and strongly influenced by geometry. We take advantage of the complementary length and time scales of muon spin rotation, relaxation and resonance (mu+SR) microscopic technique and bulk AC/DC magnetic susceptibility measur...

Sodium transition metal oxides with a layered structure are one of the most widely studied cathode materials for Na+-ion batteries. Since the mobility of Na+ in such cathode materials is a key factor that governs the performance of material, electrochemical and muon spin rotation and relaxation techniques are here used to reveal the Na+-ion mobilit...

The diffusive behavior in a spinel-type Li ⁺ ion battery material, Li[Ni 1/2 Mn 3/2 ]O 4 , has been studied with positive and negative muon spin rotation and relaxation ( μ ± SR) measurements in the temperature range between 200 and 400 K using a powder sample. The implanted μ ⁺ locates at an interstitial site near O ²⁻ ion so as to form a O–H like...

Although a positive muon spin rotation and relaxation (μ⁺SR) technique is commonly used for materials science, its counterpart technique, μ⁻SR, has been less common due to its very limited availability and a very slow counting rate. However, a combination between an intense pulsed muon beam, such as, J-PARC and ISIS, and the development of a multi-...

The ferromagnetic (FM) nature of the metallic LaCo$_2$P$_2$ was investigated with the positive muon spin rotation, relaxation and resonance ($\mu^+$SR) technique. Transverse and zero field $\mu^+$SR measurements revealed that the compound enters a long range FM ground state at $T_{\rm C}=130.91(65)$~K, consistent with previous studies. Based on the...

We report the successful synthesis, crystal structure, and electrical properties of Sr3Re2O9, which contains Re6+ with the 5d1 configuration. This compound is isostructural with Ba3Re2O9 and shows a first-order structural phase transition at ∼370 K. The low-temperature (LT) phase crystallizes in a hettotype structure of Ba3Re2O9, which is different...

(This is an open access paper.) An A-type antiferromagnet, NaNiO2, was examined by means of positive muon spin rotation and relaxation (μ+SR) measurements and first-principles calculations based on a density functional theory (DFT). Below TN = 20 K, a clear muon spin precession signal was observed in the μ+SR time spectrum recorded under zero field...

(This is an open access paper.) High-pressure synthesized quasi-one-dimensional NaMn 2 O 4 and Li 0.92 Mn 2 O 4 are both antiferromagnetic insulators. Here their atomic and magnetic structures are investigated using neutron powder diffraction. The present crystal structural analyses of NaMn 2 O 4 reveal that a Mn 3+ /Mn 4+ charge-ordering state exi...

(This is an open access paper.) In the quest for developing novel and efficient batteries, a great interest has been raised for sustainable K-based honeycomb layer oxide materials, both for their application in energy devices as well as for their fundamental material properties. A key issue in the realization of efficient batteries based on such co...

(This is an open access paper.) The internal magnetic field in a sodium battery compound, i.e., the paramagnet Na 0.7 CoO 2 , was investigated with negative muon spin rotation and relaxation (μ − SR), and the result was compared with the results previously obtained with μ + SR. The majority of implanted μ − is captured on an oxygen nucleus, while μ...

(This is an open access paper.) We report a muon spin rotation (μ+SR) study of the magnetic properties of the double perovskite compound LaSrNiReO6. Using the unique length and time scales of the μ+SR technique, we successfully clarify the magnetic ground state of LaSrNiReO6, which was previously deemed as a spin glass state. Instead, our μ+SR resu...

We report a muon spin rotation ($\mu^{+}$SR) study of the magnetic properties of the double perovskite compound LaSrNiReO$_{6}$. Using the unique length and time scales of the $\mu^{+}$SR technique, we successfully clarify the magnetic ground state of LaSrNiReO$_{6}$, which was previously deemed as a spin glass state. Instead, our $\mu^{+}$SR resul...

The high-pressure synthesised quasi-one-dimensional compounds NaMn2O4 and Li0.92Mn2O4 are both antiferromagnetic insulators, and here their atomic and magnetic structures were investigated using neutron powder diffraction. The present crystal structural analyses of NaMn2O4 reveal that Mn3+/Mn4+ charge-ordering state exist even at low temperature (d...

(This is an open access paper.) Metallic Li deposited on the anode is known to induce short circuiting and degradation of the charge capacity of Li-ion batteries. However, no reliable technique is currently available to observe such Li metal without removing the case of the battery. An elemental analysis using muonic X-rays is proposed here because...

(This is an open access paper.) The magnetic nature of the quasi-one-dimensional BaVS3 has been studied as a function of temperature down to 0.25 K and pressure up to 1.97 GPa on a powder sample using the positive muon spin rotation and relaxation (μ+SR) technique. At ambient pressure, BaVS3 enters an incommensurate antiferromagnetic ordered state...

Investigation of potassium-ion (K$^+$) dynamics in materials using magneto-spin properties is an indomitable feat, due to its inherently weak nuclear magnetic moment relative to other lithophile ions such as sodium. On the other hand, spin-polarised muons in muon spin rotation and relaxation ($\mu^+$SR) measurements are known to have strong gyromag...

(This article is Open Access) We have studied a mosaic of 1T-CrSe2 single crystals using β-detected nuclear magnetic resonance of ⁸Li from 4 to 300 K. We identify two broad resonances that show no evidence of quadrupolar splitting, indicating two magnetically distinct environments for the implanted ion. We observe stretched exponential spin lattice...

We report measurements of the diffusion rate of isolated ion-implanted Li+8 within ∼120 nm of the surface of oriented single-crystal rutile TiO2 using a radiotracer technique. The α particles from the Li8 decay provide a sensitive monitor of the distance from the surface and how the depth profile of Li8 evolves with time. The main findings are that...

We have studied a mosaic of 1T-CrSe$_2$ single crystals using $\beta$-detected nuclear magnetic resonance of $^{8}$Li from 4 to 300 K. We identify two broad resonances that show no evidence of quadrupolar splitting, indicating two magnetically distinct environments for the implanted ion. We observe stretched exponential spin lattice relaxation and...

(This is an open access paper.) The ferromagnetic (FM) nature of Nd2Fe14B has been investigated with muon spin rotation and relaxation (μ+SR) measurements on an aligned, sintered plate-shaped sample. A clear muon spin precession frequency (fFM) corresponding to the static internal FM field at the muon site showed an order parameter-like temperature...

(accepted for publication in Physical Review Materials on May 24, 2019) The ferromagnetic (FM) nature of Nd2Fe14B has been investigated with muon spin rotation and relaxation ({\mu}^+SR) measurements on an aligned, sintered plate-shaped sample. A clear muon spin precession frequency (f_{FM}) corresponding to the static internal FM field at the muon...

Anomalous successive structural transitions in layered 1T-CrSe2 with an unusual Cr4+ valency were investigated by synchrotron X-ray diffraction. 1T-CrSe2 exhibits dramatic structural changes in in-plane Cr–Cr and interlayer Se–Se distances, which originate from two interactions: (i) in-plane Cr–Cr interactions derived from Peierls-like trimerizatio...

[This is an open access paper. Go to doi.org/10.7566/JPSCP.25.011009] We applied a positive muon spin rotation and relaxation (μ+SR) technique to battery materials re- search by investigating Li diffusion in cathode and electrolyte materials. Recently, we have found that Li diffusion in graphite, which is commonly used as an anode material in Li-io...

[Although I pointed out the error of Figs. 7 & 8 on the proof, this paper was published without correction. Thus, I here attach a complete version.] Spin polarized particles exhibiting beta decay, such as, muon and 8Li are very useful for detecting internal magnetic fields in solids. Here, I review our attempts to use these spin polarized beams for...

The K2Cr8O16 compound belongs to a series of quasi-1D compounds with intriguing magnetic properties that are stabilized through a high-pressure synthesis technique. In this study, a muon spin rotation, relaxation and resonance (μ+SR) technique is used to investigate the pressure dependent magnetic properties up to 25 kbar. μ+SR allows for measureme...

We report diffusion measurements of isolated ion implanted $^{8}$Li$^{+}$ near the surface of oriented single crystal rutile TiO$_2$, using a radiotracer technique which is sensitive to the attenuation of the $\alpha$-emissions from $^{8}$Li. We measure the rate of diffusion towards the crystal surface over a distance of $\sim 120$ nm. Our measurem...

Introduction A solid-electrolyte interphase (SEI) is known to play a significant role on safety and durability of lithium ion batteries (LIBs). Here, the chemical composition of SEI has been usually determined with an ex-situ X-ray photoelectron spectroscopic analysis technique. However, there are few reports on the structural properties of SEI, su...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011016) The diffusion coefficient of Li ions in solid electrolytes is one of the essential parameters for determining their ionic conductivity. In order to clarify the Li-diffusion along one-dimensional channels of recently developed solid sulfide electrolytes, we have measured muon spin r...

In order to elucidate the magnetic ground state of the cluster magnets with a half filled triangu- lar lattice, we have recorded zero field (ZF-) and weak transverse field (wTF-) μ+SR spectra using powder samples of Li2InMo3O8 and Li2ScMo3O8 down to 1.9 K. The ZF measurements at 1.9 K demonstrated the presence of static magnetic order in Li2InMo3O8...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011009) The magnetic ground state of the A-site ordered chromium perovskites, ACu3Cr4O12 with A = Y, La, Eu, and Lu has been investigated with μ+SR using powder samples prepared by a high-pressure technique. Weak transverse field measurements revealed that the four compounds enter into a m...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011025) LiTi2O4 and related spinel compounds have attracted considerable attention both as a superconductor as well as an electrode material for Li-ion batteries. In this brief report we have studied thin (220 nm) films of LiTi2O4 using the low-energy muon spin rotation/relaxation (LEM) te...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011005) The magnetic nature of layered chromium perovskites, Srn+1CrnO3n+1 (n = 1 − 3) was studied by μ+SR using powder samples prepared by a high pressure synthesis technique. According to the weak transverse field measurements, each sample entered a magnetically ordered state below 110 K...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011011) In this work we present a combination of zero-field and high transverse-field muon spin rota- tion/relaxation (μ+SR) measurements. The current μ+SR Knight-shift measurements clearly shows that Ca3Co2O6 display strong spin correlations even at room-temperature. Further, several anom...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011019) We report a muon spin rotation and relaxation (μ+SR) study on Na0.7CoO2 powder samples, where the sodium (Na) has been intercalated via an electrochemical reaction inside a Na- ion battery. The zero field μ+SR measurement at T = 2 K shows a paramagnetic state for the as-grown sampl...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011018)

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011017) In order to know the change in Li diffusion during the operation of Li-ion batteries, we have initiated to measure Li diffusion not only in a powder sample but also in a cathode sheet with μ+SR. As the first step, we have measured μ+SR spectra on a cathode sheet, in which a mixture...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011010) In this study we have investigated the low-dimensional correlated spin system SrCu2(BO3)2 using ambient-pressure muon spin rotation/relaxation (μ+SR). The zero-field data are similar to previ- ously published data, but in addition, they give an even clearer sign of the two low-temp...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011004) In order to study the antiferromagnetic (AF) nature of a novel two-dimensional triangular compound, LiCrSe2, we have measured muon spin rotation and relaxation (μ+SR) spectra using a powder sample down to 2 K. A bulk AF transition was clearly observed at TN = 30 K by weak transvers...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011047) It has long been desirable to develop a spin-1/2 nucleus as a probe for β-detected NMR studies of solid materials. As a pure magnetic probe, it would greatly compliment our most extensively used nucleus 8Li (spin-2), which is sensitive to both dipolar and quadrupolar interactions....

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011006) In this study, the magnetic ground state of the hollandite type material K2Cr8O16 was tuned by exter- nally applied pressure and investigated using μ+SR method in Zero-field (ZF) and weak-transverse field (wTF) configurations. As a result, the obtained magnetic transition temperatu...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011021) It is widely believed that a space-charge layer (SCL) exists at the vicinity of a boundary between a solid electrolyte layer and electrode layer in an all solid-state Li-ion battery due to the differ- ence of their chemical potentials, although there are no direct experimental evid...

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011041)

(This is an OPEN ACCESS paper. Go to doi: 10.7566/JPSCP.21.011015) A dynamic behavior in spinel Li[Ni1/2Mn3/2]O4 has been studied with μ+SR measurements in film and powder samples in the temperature range between 5 and 500 K. Both samples exhibited a broad ferromagnetic transition below 120 K, indicating the random distribution of Ni and Mn ions a...

The microscopic magnetic nature of the A-site ordered chromium perovskites CaCu3Cr4O12 and LaCu3Cr4O12 and their solid-solution system, Ca1−xLaxCu3Cr4O12, with x=0.2, 0.4, and 0.8, has been studied with muon spin rotation and relaxation (μ+SR) measurements down to 2 K using a powder sample. For CaCu3Cr4O12, μ+SR revealed the formation of static ant...

(This is an OPEN ACCESS paper, go to DOI: 10.1103/PhysRevB.97.024416) The microscopic magnetic nature of the A-site ordered chromium perovskites CaCu3Cr4O12 and LaCu3Cr4O12 and their solid-solution system, Ca1−xLaxCu3Cr4O12, with x = 0.2, 0.4, and 0.8, has been studied with muon spin rotation and relaxation (μ+SR) measurements down to 2 K using a...

We have investigated the magnetic ground state of a novel one-dimensional compound, NaCr2O4, in which Cr2O4 double chains, i.e. zig-zag chains are aligned parallel to the b-axis, by means of both muon-spin rotation and relaxation (μ+SR) and neutron diffraction (ND) measurements. The μ+SR results reveal the formation of static antiferromagnetic orde...

Diffusion of Li+ in (111) oriented thin films of the spinels Li4Ti5O12 and LiTi2O4 has been studied with Li8β-detected NMR in the temperature range between 5 and 310 K. In Li4Ti5O12, the spin-lattice relaxation rate (1/T1) versus temperature shows a clear maximum around 100 K (=Tmax) which we attribute to magnetic freezing of dilute Ti3+ local magn...

(This is an OPEN ACCESS paper, go to DOI: 10.1103/PhysRevB.96.094402) Diffusion of Li+ in (111) oriented thin films of the spinels Li4Ti5O12 and LiTi2O4 has been studied with 8Li β-detected NMR in the temperature range between 5 and 310 K. In Li4Ti5O12, the spin-lattice relaxation rate (1/T1) versus temperature shows a clear maximum around 100 K (...

(This is an OPEN ACCESS paper, go to DOI: 10.1039/C7CP02047C) In order to study a diffusive behavior of Li+ in Li intercalated graphites, we have measured muon spin relaxation (μ+SR) spectra for C6Li and C12Li synthesized with an electrochemical reaction between Li and graphite in a Li-ion battery. For both compounds, it was found that Li+ ions st...