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高等学校化学研究 ›› 2005, Vol. 21 ›› Issue (6): 707-713.

• Articles • 上一篇    下一篇

Phase Separation and Transport Behavior in La0.67-xSmxSr0.33MnO3 System

LIU Ning1,2, YAN Guo-qing1, XU Su-jun2   

  1. 1. Department of Physics, Suzhou College, Suzhou 23400, P. R. China;
    2. Structure Research Laboratory, Science and Technology University of China, Hefei 230026, P. R. China
  • 收稿日期:2004-11-18 出版日期:2005-11-23 发布日期:2011-08-06
  • 基金资助:

    Supported by the National Natural Science Foundation of China(No.19934003) and the State Key Project of Fundamental Research of China(No.001CB610604)

Phase Separation and Transport Behavior in La0.67-xSmxSr0.33MnO3 System

LIU Ning1,2, YAN Guo-qing1, XU Su-jun2   

  1. 1. Department of Physics, Suzhou College, Suzhou 23400, P. R. China;
    2. Structure Research Laboratory, Science and Technology University of China, Hefei 230026, P. R. China
  • Received:2004-11-18 Online:2005-11-23 Published:2011-08-06
  • Supported by:

    Supported by the National Natural Science Foundation of China(No.19934003) and the State Key Project of Fundamental Research of China(No.001CB610604)

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摘要： The magnetic behavior and the transport behavior of La0.67-xSmxSr0.33MnO3 (x=0.00, 0.10, 0.20, 0.30,0.40, 0.50 and 0.60) systems were studied through measuring the M-T curves, electron spin resonance (ESR)curves and ρ-T curves.The samples exhibit a long-range ferromagnetic order when x = 0.00, 0.10, a cluster-spin glass state when x = 0.20 and 0.30, and an anti-ferromagnetic state at low temperatures when x = 0.40, 0.50 and 0.60.The samples of x = 0.30 and 0.40 show phase separation at temperatures above Tc.The transport behavior of the sample of x = 0.60 becomes abnormal when the doping is high, and an insulator-metal transition occurs near Tc and then a metal-insulator transition occurs, which rarely appears in an ABO3 structure.It is concludedthat the magnetic and electric behavior changes of the systems depend on the extra magnetism and lattice distortion effect induced by Sm doping.

关键词: Magnetic structure, Phase separation, Transport behavior, Colossal magnetoresistance effect

Abstract: The magnetic behavior and the transport behavior of La0.67-xSmxSr0.33MnO3 (x=0.00, 0.10, 0.20, 0.30,0.40, 0.50 and 0.60) systems were studied through measuring the M-T curves, electron spin resonance (ESR)curves and ρ-T curves.The samples exhibit a long-range ferromagnetic order when x = 0.00, 0.10, a cluster-spin glass state when x = 0.20 and 0.30, and an anti-ferromagnetic state at low temperatures when x = 0.40, 0.50 and 0.60.The samples of x = 0.30 and 0.40 show phase separation at temperatures above Tc.The transport behavior of the sample of x = 0.60 becomes abnormal when the doping is high, and an insulator-metal transition occurs near Tc and then a metal-insulator transition occurs, which rarely appears in an ABO3 structure.It is concludedthat the magnetic and electric behavior changes of the systems depend on the extra magnetism and lattice distortion effect induced by Sm doping.

Key words: Magnetic structure, Phase separation, Transport behavior, Colossal magnetoresistance effect