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Impact of bicritical fluctuation on magnetocaloric phenomena in perovskite manganites

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arxiv 1010.3351 v1 pith:5TR5YJGV submitted 2010-10-16 cond-mat.str-el cond-mat.mtrl-sci

Impact of bicritical fluctuation on magnetocaloric phenomena in perovskite manganites

H. Sakai , Y. Taguchi , Y. Tokura This is my paper
classification cond-mat.str-el cond-mat.mtrl-sci
keywords temperaturechangeentropyfluctuationimpactmagnetocaloricmanganitesprofile
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Variation of magnetocaloric (MC) effects has been systematically investigated for colossal magnetoresistive (CMR) manganites R0.6Sr0.4MnO3 (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, which can be extensively controlled by the chemical composition.

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