中国物理B ›› 2006, Vol. 15 ›› Issue (11): 2724-2730.doi: 10.1088/1009-1963/15/11/044

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The electric and magnetic properties of epitaxially grownA0.5-xLaxSr0.5MnO3 (A=Pr, Nd) thin film

聂六英1, 谢中1, 赵立华1, 杨少波2, 赵柏儒2, 钟建平3, 袁洁3, 朱少将3, 许波3, 曹立新3, 丘祥刚3   

  1. (1)College of Material Science and Engineering, Hunan University,Changsha, China; (2)College of Material Science and Engineering, Hunan University,Changsha, China;National Laboratory for Superconductivity, Institute of Physics,Chinese Academy of Sciences, Beijing100080, China; (3)National Laboratory for Superconductivity, Institute of Physics,Chinese Academy of Sciences, Beijing100080, China
  • 收稿日期:2006-03-07 修回日期:2006-06-21 出版日期:2006-11-20 发布日期:2006-11-20
  • 基金资助:
    Project supported by the State Key Development Program for Basic Research of China (Grant No TG1998061406) and the\linebreak \makebox[1.6mm]{}National Natural Science Foundation of China (Grant No 90206019).

The electric and magnetic properties of epitaxially grown A0.5-xLaxSr0.5MnO3 (A=Pr, Nd) thin film

Yang Shao-Bo(杨少波)a)b), Zhong Jian-Ping(钟建平)b), Yuan Jie(袁洁)b), Zhu Shao-Jiang(朱少将)b), Xu Bo(许波)b), Cao Li-Xin(曹立新)b), Qiu Xiang-Gang(丘祥刚)b), Nie Liu-Ying(聂六英)a), Xie Zhong(谢中)a), Zhao Li-Hua(赵立华)a), and Zhao Bai-Ru(赵柏儒)a)b)†   

  1. a College of Material Science and Engineering, Hunan University, Changsha, China; b National Laboratory for Superconductivity, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China
  • Received:2006-03-07 Revised:2006-06-21 Online:2006-11-20 Published:2006-11-20
  • Supported by:
    Project supported by the State Key Development Program for Basic Research of China (Grant No TG1998061406) and the\linebreak \makebox[1.6mm]{}National Natural Science Foundation of China (Grant No 90206019).

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摘要： The epitaxial (single crystal-like) Pr$_{0.4}$La$_{0.1}$Sr$_{0.5}$MnO$_{3}$ (PLSMO) and Nd$_{0.35}$La$_{0.15}$Sr$_{0.5}$MnO$_{3}$ (NLSMO) thin films are prepared and characterized, and the electric and magnetic properties are examined. We find that both PLSMO and NLSMO have their own optimum deposition temperature ($T_{\rm o})$ in their growing into epitaxial thin films. When the deposition temperature is higher than $T_{\rm o}$, a $c$-axis oriented but polycrystalline thin film grows; when the deposition temperature is lower than $T_{\rm o}$, the thin film tends to be $a$-axis oriented and also polycrystalline. The most important point is that for the epitaxial PLSMO and NLSMO thin films the electronic phase transitions are closely consistent with the magnetic phase transitions, i.e. an antiferromagnetic phase corresponds to an insulating state, a ferromagnetic phase corresponds to a metallic state and a paramagnetic phase corresponds to a semiconducting state, while for the polycrystalline thin films the electronic phase transitions are always not consistent with the magnetic transitions.

关键词: epitaxial, polycrystalline, thin film, electric and magnetic phase transition

Abstract: The epitaxial (single crystal-like) Pr$_{0.4}$La$_{0.1}$Sr$_{0.5}$MnO$_{3}$ (PLSMO) and Nd$_{0.35}$La$_{0.15}$Sr$_{0.5}$MnO$_{3}$ (NLSMO) thin films are prepared and characterized, and the electric and magnetic properties are examined. We find that both PLSMO and NLSMO have their own optimum deposition temperature ($T_{\rm o})$ in their growing into epitaxial thin films. When the deposition temperature is higher than $T_{\rm o}$, a $c$-axis oriented but polycrystalline thin film grows; when the deposition temperature is lower than $T_{\rm o}$, the thin film tends to be $a$-axis oriented and also polycrystalline. The most important point is that for the epitaxial PLSMO and NLSMO thin films the electronic phase transitions are closely consistent with the magnetic phase transitions, i.e. an antiferromagnetic phase corresponds to an insulating state, a ferromagnetic phase corresponds to a metallic state and a paramagnetic phase corresponds to a semiconducting state, while for the polycrystalline thin films the electronic phase transitions are always not consistent with the magnetic transitions.

Key words: epitaxial, polycrystalline, thin film, electric and magnetic phase transition

中图分类号:  (Electrical properties of specific thin films)

  • 73.61.-r
68.37.Ps (Atomic force microscopy (AFM)) 71.30.+h (Metal-insulator transitions and other electronic transitions) 75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 81.15.Fg (Pulsed laser ablation deposition)