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对电脉冲诱导的不同电阻态下La0.7Ca0.3MnO3样品的比热进行了研究.实验结果表明，电脉冲导致La0.7Ca0.3MnO3样品比热随电阻状态发生可逆变化.比热随电阻状态的减小而减小.低温比热拟合及不同电阻状态下的比热差与温度关系说明，声子对比热的贡献不随电阻状态变化，磁性和载流子对比热的贡献是导致La0.7Ca0.3MnO3样品比热变化的原因.电脉冲诱导O离子沿一维扩展性缺陷的电化学迁移，导致材料中局部区域的O离子浓度发生变化.O离子浓度的变化导致载流子浓度的变化，同时载流子浓度的变化将使得低温下磁性耦合强度发生变化，从而导致比热发生变化.
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关键词:
- La0.7Ca0.3MnO3 /
- 比热 /
- 氧离子迁移
The specific heat of polycrystalline La0.7Ca0.3MnO3 at different resistance states induced by electric pulses was studied. It was found that the specific heat decreases with decreasing resistance, and the change is reversible. The reversible change of specific heat was shown to be mainly due to the ferromagnetic-spin-waves component and charge carriers component by fitting the specific heat data. These results indicate that the electric pulses modulated the magnetic configuration of LCMO at low temperature, which would result in large variation in magnetization and specific heat associated with ferromagnetic-spin-waves.-
Keywords:
- La0.7Ca0.3 MnO3 /
- oxygen motion /
- specific heat
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[13] ］Xu J, Luo J L, Chen Z J, Long Y Z, Bai H Y, Wan M X, Wang W L 2003 Acta Phys. Sin. 52 947 (in Chinese) ［许杰、雒建林、陈兆甲、龙云泽、白海洋、万梅香、王万录 2003 52 947］
[14] ］Woodfield B F, Wilson M L, Byers J M 1997 Phys. Rev. Lett. 78 3201
[15] ］Zhang J, Luo J L, Bai H Y,Chen Z J, Lin D H, Che G C, Ren Z A, Zhao Z X, Jin D 2002 Acta Phys. Sin. 51 6540 (in Chinese) ［张杰、雒建林、白海洋、陈兆甲、林德华、车广灿、任治安、赵忠贤、金铎 2002 51 6540］
[16] ］Li R W, Wang Z H, Chen X, Shen B G 1999 Acta Phys. Sin. 48 S105 (in Chinese) ［ 李润伟、王志宏、陈新、沈保根 1999 48 S105］
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[1] ［1］Liu S Q, Wu N J, Lgnatiev A 2000 Appl. Phys. Lett. 76 2749
[2] ［2］Ahn K H, Lookman T, Bishop A R 2004 Nature 428 401
[3] ［3］Nagaev E L 1996 Phys. Lett. A 218 367
[4] ［4］Li Q, Wang Z G, Liu S, Xing Z W, Liu M 2007 Acta Phys. Sin. 56 1637 (in Chinese) ［李倩、王之国、刘甦、刑仲文、刘楣 2007 56 1637］
[5] ［5］Tulina N A, Sirotkin V V 2004 Physica C 400 105
[6] ［6］Szot K, Speier W, Bihlmayer G, Waser R 2006 Nat. Mater. 5 312
[7] ［7］Baikalov A, Wang Y Q, Shen B, Lorenz B, Tsui S, Sun Y Y, Xue Y Y 2003 Appl. Phys. Lett. 83 957
[8] ［8］Nian Y B, Strozier J, Wu N J, Chen X, Ignatiev A 2007 Phys. Rev. Lett. 98 146403
[9] ［9］Ziese M, Bollero A, Panagiotopoulos I, Moutis N 2005 Phys. Rev. B 72 024453
[10] ］Long Y Z, Zheng P, Zhang Z M, Wei Z X, Wan M X, Chen Z J, Wang N L 2002 Acta Phys. Sin. 51 2090 (in Chinese) ［龙云泽、郑萍、张志明、魏志祥、万梅香、陈兆甲、王楠林 2002 51 2090］
[11] ］Ghivelder L, Abrego C I, Gusmao M A, Alonso J A, Cohen L F 1999 Phys. Rev.B 60 12184
[12] ］Luo J L, Zhang J, Chen Z J, Bai H Y, Wang Y P, Meng J B, Jin D, Ren Z A, 2001 Chin. Phys. Lett. 18 820
[13] ］Xu J, Luo J L, Chen Z J, Long Y Z, Bai H Y, Wan M X, Wang W L 2003 Acta Phys. Sin. 52 947 (in Chinese) ［许杰、雒建林、陈兆甲、龙云泽、白海洋、万梅香、王万录 2003 52 947］
[14] ］Woodfield B F, Wilson M L, Byers J M 1997 Phys. Rev. Lett. 78 3201
[15] ］Zhang J, Luo J L, Bai H Y,Chen Z J, Lin D H, Che G C, Ren Z A, Zhao Z X, Jin D 2002 Acta Phys. Sin. 51 6540 (in Chinese) ［张杰、雒建林、白海洋、陈兆甲、林德华、车广灿、任治安、赵忠贤、金铎 2002 51 6540］
[16] ］Li R W, Wang Z H, Chen X, Shen B G 1999 Acta Phys. Sin. 48 S105 (in Chinese) ［ 李润伟、王志宏、陈新、沈保根 1999 48 S105］
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