太赫兹瞬态光谱研究La0.7Ca0.3MnO3薄膜的温度相关相变
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1.上海电力大学 电子与信息工程学院,上海 200082;2.上海大学 物理系,上海 200444;3.中国科学院上海技术物理研究所 红外物理国家重点实验室,上海 200083

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O433.1

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The temperature-dependent phase transition in La0.7Ca0.3MnO3 film probed with terahertz transient spectroscopy
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Affiliation:

1.School of Electronic & Information Engineering, Shanghai University of Electric Power, Shanghai 200082, China;2.Department of Physics, Shanghai University, Shanghai 200444, China;3.State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China

Fund Project:

Supported by National Natural Science Foundation of China (11674213, 61735010, 11647023, 61625505), Natural Science Foundation of Shanghai (17ZR1411500)

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    摘要:

    利用太赫兹瞬态光谱研究了La0.7Ca0.3MnO3薄膜的热力学性质。La0.7Ca0.3MnO3薄膜的金属-绝缘体相变温度在260 K左右,与铁磁-顺磁相变温度几乎相同。结果表明,La0.7Ca0.3MnO3薄膜的电导率与薄膜中磁矩取向密切相关。研究发现在40~200 K的低温范围内,La0.7Ca0.3MnO3薄膜的电导率可以用Drude模型拟合,在210~290 K的高温范围内可以用Drude-Lorentz模型拟合。

    Abstract:

    The thermodynamics of La0.7Ca0.3MnO3 film by terahertz transient spectroscopy were presented. The temperature of metal-insulator phase transition of La0.7Ca0.3MnO3 film is observed to occur around 260 K, which is almost the same as that of the ferromagnetic-paramagnetic phase transition. It indicates that the conductivity of the La0.7Ca0.3MnO3 film is closely related to the order of magnetic moments in the film. We find the conductivity of the La0.7Ca0.3MnO3 film can be reproduced with Drude model at low temperature range from 40 K to 200 K, and Drude-Lorentz model at high temperature region from 210 K to 290 K.

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李高芳,许艳霞,刘现款,马国宏,高艳卿,崔昊杨,黄志明,褚君浩.太赫兹瞬态光谱研究La0.7Ca0.3MnO3薄膜的温度相关相变[J].红外与毫米波学报,2021,40(4):490~495]. LI Gao-Fang, XU Yan-Xia, LIU Xian-Kuan, MA Guo-Hong, GAO Yan-Qing, CUI Hao-Yang, HUANG Zhi-Ming, CHU Jun-Hao. The temperature-dependent phase transition in La0.7Ca0.3MnO3 film probed with terahertz transient spectroscopy[J]. J. Infrared Millim. Waves,2021,40(4):490~495.]

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  • 收稿日期:2020-09-29
  • 最后修改日期:2021-08-06
  • 录用日期:2020-11-12
  • 在线发布日期: 2021-07-28
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