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Title: Specific heat of single-crystalline Pr0.63Ca0.37MnO3 in the presence of a magnetic field
Authors: Raychaudhuri, A K
Guha, Ayan
Das, I
Rawat, R
Rao, C N R
Keywords: Temperature Specific-Heat
Charge-Ordered Pr0.63ca0.37mno3
Issue Date: 15-Sep-2001
Publisher: American Physical Society
Citation: Physical Review B 64(16), 165111-(1-9) (2001)
Abstract: We present the results of a study of the specific heat on a single crystal of Pr0.63Ca0.37MnO3 performed over a temperature range 3-300 K in the presence of 0 and 8 T magnetic fields. An estimate of the entropy and latent heat in a magnetic field at the first-order charge-ordering (CO) transition is presented. The total entropy change at the CO transition, which is approximate to1.8 J/mol K at 0 T, decreases to similar to1.5 J/mol K in the presence of a 8 T magnetic field. Our measurements enable us to estimate the latent heat L(CO)approximate to 235 J/mol involved in the CO transition. Since the entropy of the ferromagnetic metallic (FMM) state is comparable to that of the charge-ordered insulating state, a subtle change in entropy stabilizes either of these two states. Our low-temperature specific heat measurements reveal that the linear term is absent at 0 T and surprisingly not seen even in the metallic FMM state.
Other Identifiers: 1098-0121
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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