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dc.contributor.authorNagapriya, K S-
dc.contributor.authorRaychaudhuri, A K-
dc.contributor.authorBansal, Bhavtosh-
dc.contributor.authorVenkataraman, V-
dc.contributor.authorRao, C N R-
dc.identifier.citationPhysical Review B 71(2), 024426-(1-6) (2005)en_US
dc.description.abstractWe have investigated the specific heat and resistivity of a single crystal of Pr0.63Ca0.37MnO3 around the charge ordering (CO) transition temperature, T-CO, in the presence of high magnetic fields (less than or equal to12 T) which can melt the charge-ordered state. At low magnetic fields (less than or equal to10 T), the manganite transforms from a charge-disordered paramagnetic insulating (PI) state to a charge-ordered insulating (COI) state as the temperature is lowered. The COI state becomes unstable beyond a threshold magnetic field and melts to a ferromagnetic metallic phase (FMM). This occurs for T<T-CO. However, above a critical field mu(0)H(rho)(*), the sample shows the onset of a metallic phase for T>T-CO and the COI transition occurs from a metallic phase. The onset temperature of the high-field metallic behavior decreases with an increase in the field and above a field mu(0)H(*), the COI transition does not occur and the CO state ceases to occur at all T. The entropy change involved in the CO transition, DeltaS(CO)approximate to1.6 J/mol K at 0 T, decreases with increasing field and eventually vanishes for a field mu(0)H(*). The collapse of the CO state above mu(0)H(*) is thus associated with a collapse of the entropy that stabilizes the CO state.en_US
dc.publisherAmerican Physical Societyen_US
dc.rights© 2005 The American Physical Societyen_US
dc.subjectInsulator-Metal Transitionen_US
dc.titleCollapse of the charge-ordering state at high magnetic fields in the rare-earth manganite Pr0.63Ca0.37MnO3en_US
Appears in Collections:Research Papers (Prof. C.N.R. Rao)

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