中国物理B ›› 2015, Vol. 24 ›› Issue (2): 27504-027504.doi: 10.1088/1674-1056/24/2/027504

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effects of growing conditions on the electric and magnetic properties of strained La2/3Sr1/3MnO3 thin films

卢海霞, 王晶, 沈保根, 孙继荣   

  1. Beijing National Laboratory for Condensed Matter Physics and the Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2014-08-19 修回日期:2014-10-14 出版日期:2015-02-05 发布日期:2015-02-05
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 111374348, 11134007, 11174345, and 111474341) and the National Basic Reaearch Program of China (Grant Nos. 2013CB921700, 2011CB921801, and 2012CB933000).

Effects of growing conditions on the electric and magnetic properties of strained La2/3Sr1/3MnO3 thin films

Lu Hai-Xia (卢海霞), Wang Jing (王晶), Shen Bao-Gen (沈保根), Sun Ji-Rong (孙继荣)   

  1. Beijing National Laboratory for Condensed Matter Physics and the Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2014-08-19 Revised:2014-10-14 Online:2015-02-05 Published:2015-02-05
  • Contact: Sun Ji-Rong E-mail:jrsun@iphy.ac.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 111374348, 11134007, 11174345, and 111474341) and the National Basic Reaearch Program of China (Grant Nos. 2013CB921700, 2011CB921801, and 2012CB933000).

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摘要： We investigate the growing condition dependences of magnetic and electric properties of the La2/3Sr1/3MnO3 thin films grown on SrTiO3 (001) substrates. With reducing the film thickness and growth pressure, the Curie temperature (TC) drops off, and the magnetism and metallicity are suppressed. At an appropriate deposition temperature, we can obtain the best texture and remarkably enhance the magnetic and electrical properties. However, the resistivity of film cannot be modulated by changing the dc current and green light intensity. This result may be induced by the coherent strains in the epitaxially grown film due to its lattice mismatching that of the SrTiO3 substrate. Furthermore, we show that the relations between the magnetism and the resistivity for the typical films with different thickness values. For the 13.4-nm-thick film, the R-T curve presents two transition behaviors: insulator-to-metal and metal-to-insulator in the cooling process: the former corresponds to magnetic transition, and the later correlates with thermal excitation conduction.

关键词: growing condition, magnetism, resistivity

Abstract: We investigate the growing condition dependences of magnetic and electric properties of the La2/3Sr1/3MnO3 thin films grown on SrTiO3 (001) substrates. With reducing the film thickness and growth pressure, the Curie temperature (TC) drops off, and the magnetism and metallicity are suppressed. At an appropriate deposition temperature, we can obtain the best texture and remarkably enhance the magnetic and electrical properties. However, the resistivity of film cannot be modulated by changing the dc current and green light intensity. This result may be induced by the coherent strains in the epitaxially grown film due to its lattice mismatching that of the SrTiO3 substrate. Furthermore, we show that the relations between the magnetism and the resistivity for the typical films with different thickness values. For the 13.4-nm-thick film, the R-T curve presents two transition behaviors: insulator-to-metal and metal-to-insulator in the cooling process: the former corresponds to magnetic transition, and the later correlates with thermal excitation conduction.

Key words: growing condition, magnetism, resistivity

中图分类号:  (Magnetic properties of monolayers and thin films)

  • 75.70.Ak
68.55.A- (Nucleation and growth) 75.47.Lx (Magnetic oxides)