Alisa Chernenkaya's research while affiliated with Johannes Gutenberg-Universität Mainz and other places

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Publications (8)

Figure 1. Structure of (TMTSF) 2 PF 6 . (a) Quasi-planar organic...
Figure 2. Room-temperature NEXAFS spectra of the Se M 2/3 edges of...
Figure 3. NEXAFS spectra of the F K edge (a), C K edge (b), P L 2/3...
Figure 4. Carbon 1s NEXAFS spectra of (TMTSF) 2 PF 6 taken at 260, 90,...
+8 Figure 5. Fluorine 1s NEXAFS spectra of (TMTSF) 2 PF 6 taken at 260,...
Near-Edge X-ray Absorption Fine Structure Investigation of the Quasi-One-Dimensional Organic Conductor (TMTSF)(2)PF6
Article
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  • Oct 2016
We present high-resolution near-edge X-ray absorption fine structure (NEXAFS) measurements at the P L2/3-edges, F K-edge, C K-edge and Se M2/3-edges of the quasi-one-dimensional (1D) conductor and superconductor (TMTSF)2PF6. NEXAFS allows probing the donor and acceptor moieties separately; spectra were recorded between room temperature (RT) and 30...
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Crystal Growth of new charge-transfer salts based on $\pi$-conjugated molecules
Article
  • May 2016
New charge transfer crystals of $\pi$-conjugated, aromatic molecules (phenanthrene and picene) as donors were obtained by physical vapor transport. The melting behavior, optimization of crystal growth and the crystal structure is reported for charge transfer salts with (fluorinated) tetracyanoquinodimethane (TCNQ-F$_x$, x=0, 2, 4), which was used a...
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Fig. 1. (a) Chemical structure of the DOEO molecule; (b) Spatial...
Fig. 2. (a) Electrical resistivity in the DOEO plane (R parall ) and in...
Temperature Dependence of Electronic and Magnetic Properties of (DOEO)4[HgBr4]·TCE Single Crystals
Article
Full-text available
  • Jul 2015
The temperature dependence of electronic and magnetic properties of the organic chargetransfer salt (DOEO)4[HgBr4]·TCE was investigated using magnetometry. The magnetic susceptibility shows a maximum at 40 K followed by an onset of a pronounced increase at 70 K and a constant behavior above 120 K. Implications on the charge carrier density are disc...
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Donor-anion interactions at the charge localization and charge ordering transitions of (TMTTF)2AsF6 probed by NEXAFS
Article
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  • Jun 2015
High-resolution near-edge X-ray absorption fine structure (NEXAFS) measurements at the As M-edge, F K-edge and S L-edge of the Fabre salt (TMTTF)2AsF6 were performed from room temperature (RT) to 90 K, allowing to reach the charge localization regime below Tρ ≈ 230 K and to cross the charge ordering (CO) transition at TCO ≈ 102 K. The F K-edge and...
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Fig. 1. Molecular dimer DOEO (a) and (DOEO)4[HgBr4]·TCE crystal (b)...
Fig. 2. (a, b) ESR spectra of a (DOEO) 4 [HgBr 4 ] · TCE crystal 
Fig. 3. (a) Temperature dependencies of the magnetic moment of the...
Fig. 4. (a) Survey XPS spectrum of the surface of the (DOEO) 4 [HgBr 4...
+1 Fig. 5. (a) Survey HAXPES core level spectrum of (DOEO)4[HgBr4]·TCE...
Spectroscopic fingerprints for charge localization in the organic semiconductor (DOEO)4[HgBr4]·TCE
Article
Full-text available
  • May 2015
Changes of the electronic structure accompanied by charge localization and a transition to an antiferromagnetic ground state were observed in the organic semiconductor (DOEO)4[HgBr4]·TCE. Localization starts in the temperature region of about 150 K and the antiferromagnetic state occurs below 60 K. The magnetic moment of the crystal contains contri...
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Fig. 1. (a) Chemical structure of TTF and TCNQ molecules and (b)...
Fig. 2. Nitrogen K-edge NEXAFS spectra of the TTF-TCNQ crystal at...
Nature of the empty states and signature of the charge density wave instability and upper Peierls transition of TTF-TCNQ by temperature-dependent NEXAFS spectroscopy
Article
Full-text available
  • Jan 2015
The electronic structure of TTF-TCNQ was studied by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy in order to detect a spectroscopic signature of the phase transitions, especially that occurring at 54 K, which is related to a Peierls gap opening on the TCNQ stacks. All unoccupied TCNQ orbitals predicted by first-principles calcula...
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Low-Temperature Phase Transition Detected by ESR in alpha '-(BEDT-TTF)(2)IBr2 Single Crystals
Article
  • Jan 2012
Hysteresis of the electron spin resonance (ESR) spectra of localized charge carriers has been observed in a 0 -(BEDT-TTF) 2 IBr 2 single crystals in the temperature range of 15–30 K. The first-order phase transition has been detected by ESR components. Two lines observed in the ESR spectrum correspond to low-temperature and high-temperature phases.
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Charge order-disorder phase transition detected by EPR in alpha '-(BEDT-TTF)(2)IBr2
Article
  • Jun 2010
In α′-(BEDT-TTF)2IBr2 single crystals at high temperatures (above 210K) we observed anisotropic single Lorenz line with constant integral amplitude obeying Pauli rule for charge carriers in metals. Charge ordering at 208K was accompanied by features on the temperature dependencies of the EPR parameters: integral intensity (magnetic susceptibility),...
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Citations

... eV -see Figure 4). This corresponds closely to the expected line-shape for PF -6 ions [54][55][56], and so we assign this spectrum as such, consistent with others seen in the literature [57,58]. Note that reference LiPF 6 spectra reported in Refs. ...
Reference: Revealing Solid Electrolyte Interphase Formation Through Interface-Sensitive Operando X-ray Absorption Spectroscopy
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... In order to obtain such a compound we have prepared mixed films consisting of MnPc and the particularly strong electron acceptor F 4 TCNQ. It is well known that high-quality organic charge transfer crystals with F 4 TCNQ as electron acceptor can be grown [95][96][97][98][99][100][101][102][103]. Phthalocyanine-based compounds, however, have not been reported yet. ...
Reference: Charge transfer from and to manganese phthalocyanine: Bulk materials and interfaces
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... The strong intra-stack Coulomb repulsions in the 1D electronic regime of (TMTTF) 2 PF 6 at high temperature lead to a 4k F hole localisation on the bonds of the donor zig-zag chains. Note that the charge localization on the donor dimers of the Fabre salts can be viewed as being stabilized by the response of the 4k F CDW instability of the TMTTF stacks to the 4k F potential set by the anion sublattice [18][19][20]. Charge localization induces a spincharge decoupling so that the spin degrees of freedom drive anti-ferromagnetic (AF) or spin-Peierls (SP) low-temperature orders in the Fabre salts as shown in figure 2. ...
Reference: Fermi surface electron-hole instability of the (TMTSF)2PF6 Bechgaard salt revealed by the first-principles Lindhard response function
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... The Peierls structural transition has received significant attention in Q1D crystals, as evidenced by numerous studies [10][11][12][13][14][15][16]. In the case of TTF-TCNQ crystals, intriguing observations have been made regarding this transition. ...
Reference: ANALYSIS OF PHONONS BEHAVIOR IN QUASI-ONE-DIMENSIONAL CRYSTALS OF TTT(TCNQ)2 NEAR THE PEIERLS STRUCTURAL TRANSITION IN A 3D APPROXIMATION
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