Impact of Bicritical Fluctuation on Magnetocaloric Phenomena in Perovskite Manganites

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概要

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• Variation of magnetocaloric (MC) effects has been systematically investigated for colossal magnetoresistive (CMR) manganites $R_{0.6}$Sr0.4MnO3 ($R$ = La–Gd). As the one-electron bandwidth is reduced, the temperature profile of MC effect, i.e. field-induced entropy change, exhibits a steeper drop below the ferromagnetic transition temperature due to its first-order nature promoted by a competing charge-orbital ordering instability. For these small-bandwidth systems adjacent to the metal–insulator phase boundary, a rectangular-shaped profile for the entropy change emerges with an anomalously wide temperature range and a considerable magnitude. Model calculations have indicated that the fluctuation enhanced in the phase-competing region has a strong impact on such MC features.

• 2009-11-15

著者

• Tokura Yoshinori

  Cross-correlated Materials Research Group (cmrg) And Correlated Electron Research Group (cerg) Riken

• Taguchi Yasujiro

  Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN, Wako, Saitama 351-0198

• Sakai Hideaki

  Cross-Correlated Materials Research Group (CMRG), ASI, RIKEN, Wako, Saitama 351-0198

関連論文

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• Interfacial Structure of Manganite Superlattice
• Doping Variation of Optical Properties in ZrNCl Superconductors
• Impact of Bicritical Fluctuation on Magnetocaloric Phenomena in Perovskite Manganites

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