FIG 4 - uploaded by Ivon Rocio Buitrago
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Temperature-hopping phase diagram: effect of K d. Non-zero parameters: ~ G ? 1:108 U 0 ; K d ? 0:432 U 0. Arrows indicate the main effect of increasing K d on the phase diagram on Fig. 2.
Source publication
CaCu$_3$Fe$_4$O$_{12}$ exhibits a temperature-induced transition from a ferrimagnetic-insulating phase, in which Fe appears charge disproportionated, as Fe$^{3+}$ and Fe$^{5+}$, to a paramagnetic-metallic phase at temperatures above 210 K, with Fe$^{4+}$ present. To describe it, we propose a microscopic effective model with two interpenetrating sub...
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Citations
Polycrystalline RE 2/3 Cu 3 Ti 4 O 12 (RE = Ho, Dy and La) samples were synthesized by conventional solid-state reaction method. Isothermal magnetization measurements were performed to evaluate the corresponding isothermal magnetic entropy change (ΔS M ) for the systems. Inverse magnetocaloric effect with negative values for -ΔS M (T, H) around the anti-ferromagnetic (AFM) ordering temperature is found for the La 2/3 Cu 3 Ti 4 O 12 system. Normal magnetocaloric effect with positive values for -ΔS M (T, H) is observed for the Ho 2/3 Cu 3 Ti 4 O 12 and Dy 2/3 Cu 3 Ti 4 O 12 systems. Dy 2/3 Cu 3 Ti 4 O 12 shows monotonous -ΔS M (T) behavior, while Ho 2/3 Cu 3 Ti 4 O 12 shows non-monotonous -ΔS M (T) behavior with a peak around 10 K.
