中国物理B ›› 2001, Vol. 10 ›› Issue (10): 970-973.doi: 10.1088/1009-1963/10/10/316

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LARGE MAGNETIC ENTROPY CHANGE NEAR CHARGE-ORDERED TRANSITION TEMPERATURE IN PEROVSKITE-TYPE MANGANITE

陈鹏1, 都有为2   

  1. (1)Department of Physics, South-West Normal University, Chongqing 400715, China; State Key Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China; (2)State Key Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
  • 收稿日期:2001-01-04 修回日期:2001-03-30 出版日期:2001-10-15 发布日期:2005-06-12
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No. 1999064508) and by the Major Program of the National Natural Science Foundation of China (Grant No. 19890310).

LARGE MAGNETIC ENTROPY CHANGE NEAR CHARGE-ORDERED TRANSITION TEMPERATURE IN PEROVSKITE-TYPE MANGANITE

Chen Peng (陈鹏)ab, Du You-wei (都有为)b   

  1. a Department of Physics, South-West Normal University, Chongqing 400715, China; b State Key Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China
  • Received:2001-01-04 Revised:2001-03-30 Online:2001-10-15 Published:2005-06-12
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No. 1999064508) and by the Major Program of the National Natural Science Foundation of China (Grant No. 19890310).

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摘要： The magnetocaloric effect in polycrystalline of Pr1-xSrxMnO3 (x=0.33, 0.43, 0.50) has been investigated. A large magnetic entropy change (7.1J/kgK) was discovered in Pr0.5Sr0.5MnO3 under a low magnetic field of 1T at charge-ordered state transition temperature (161K). The physical mechanism is related to a drastic magnetization change at a temperature where the field-induced magnetic, electron and structural phase transitions occur (from the antiferromagnetic charge-ordered state to the ferromagnetic charge-disordered state).

Abstract: The magnetocaloric effect in polycrystalline of Pr1-xSrxMnO3 (x=0.33, 0.43, 0.50) has been investigated. A large magnetic entropy change (7.1J/kgK) was discovered in Pr0.5Sr0.5MnO3 under a low magnetic field of 1T at charge-ordered state transition temperature (161K). The physical mechanism is related to a drastic magnetization change at a temperature where the field-induced magnetic, electron and structural phase transitions occur (from the antiferromagnetic charge-ordered state to the ferromagnetic charge-disordered state).

Key words: magnetic entropy change, charge-ordered, field-induced phase transition

中图分类号:  (Magnetocaloric effect, magnetic cooling)

  • 75.30.Sg
75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.50.-y (Studies of specific magnetic materials) 61.50.Ks (Crystallographic aspects of phase transformations; pressure effects)