Collapse of the charge ordering state at high magnetic fields in the rare-earth manganite, Pr_{0.63}Ca_{0.37}MnO_3

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dc.creatorNagapriya, K. S.
dc.creatorRaychaudhuri, A. K.
dc.creatorBansal, Bhavtosh
dc.creatorVenkataraman, V.
dc.creatorParashar, Sachin
dc.creatorRao, C. N. R.
dc.date2004-01-21
dc.date2006-02-10
dc.date.accessioned2026-07-07T06:34:49Z
dc.date.available2026-07-07T06:34:49Z
dc.descriptionWe have investigated the specific heat and resistivity of a single crystal of Pr_{0.63}Ca_{0.37}MnO_3 around the charge ordering (CO) transition temperature, T_{CO}, in the presence of high magnetic fields (<=12T) which can melt the charge ordered state. At low magnetic fields (<=10T), 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 μ_0H_ρ^*, 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 μ_0H^*, the COI transition does not occur and the CO state ceases to occur at all T. The entropy change involved in the CO transition, ΔS_{CO}~1.6J/molK at 0T, decreases with increasing field and eventually vanishes for a field μ_0H^*. The collapse of the CO state above μ_0$H$^* is thus associated with a collapse of the entropy that stabilizes the CO state.
dc.description9 pages,6 figures, Replaced with revised version
dc.identifierhttps://arxiv.org/abs/cond-mat/0401386
dc.identifierhttp://arxiv.org/abs/cond-mat/0401386
dc.identifierPHYSICAL REVIEW B 71, 024426 (2005)
dc.identifierdoi:10.1103/PhysRevB.71.024426
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/99643
dc.subjectStrongly Correlated Electrons
dc.titleCollapse of the charge ordering state at high magnetic fields in the rare-earth manganite, Pr_{0.63}Ca_{0.37}MnO_3
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