中国物理B ›› 2005, Vol. 14 ›› Issue (2): 311-316.doi: 10.1088/1009-1963/14/2/016

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Local structural distortion and magnetotransport properties of Nd0.5Pb0.5-xSrx (Mn, Fe)O3

寇志起, 邸乃力, 鲁毅, 马骁, 李庆安, 成昭华   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China
  • 收稿日期:2004-07-09 修回日期:2004-09-27 出版日期:2005-03-02 发布日期:2005-03-02
  • 基金资助:
    Project supported by the State Key Project of Fundamental Research of China (Grand No 2001CB610605) and the National Natural Science Foundation of China (Grand No 10274104).

Local structural distortion and magnetotransport properties of Nd0.5Pb0.5-xSrx (Mn, Fe)O3

Kou Zhi-Qi (寇志起), Di Nai-Li (邸乃力), Lu Yi (鲁毅), Ma Xiao (马骁), Li Qing-An (李庆安), Cheng Zhao-Hua (成昭华)   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academic of Sciences, Beijing 100080, China
  • Received:2004-07-09 Revised:2004-09-27 Online:2005-03-02 Published:2005-03-02
  • Supported by:
    Project supported by the State Key Project of Fundamental Research of China (Grand No 2001CB610605) and the National Natural Science Foundation of China (Grand No 10274104).

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摘要： Structural and magnetotransport properties of Fe-doped Nd0.5Pb0.5-xSrx (Mn, Fe)O3 are investigated by means of x-ray diffraction (XRD), M?ssbauer spectroscopy and transport measurements. Both XRD patterns and M?ssbauer spectra indicate that structural distortion decreases with Sr doping. Furthermore, it is found that Sr doping results in decrease of the resistivity at room temperature and increase of magnetoresistance. In samples, the same ratio of Mn3+ to Mn4+ is kept. So we would rather attribute these changes to the local structural distortion than the double exchange (DE) interaction. The local structural distortion of the Mn(Fe)O6 octahedron which results from the Jahn—Teller effect, can localize the conduction electrons. In this regard, we provide another evidence to prove that this Jahn—Teller distortion is an important factor that affects the transport property above Tc besides the DE coupling.

关键词: M?ssbauer spectroscopy, Jahn—Teller distortion, colossal magnetoresistance

Abstract: Structural and magnetotransport properties of Fe-doped Nd0.5Pb0.5-xSrx (Mn, Fe)O3 are investigated by means of x-ray diffraction (XRD), M?ssbauer spectroscopy and transport measurements. Both XRD patterns and M?ssbauer spectra indicate that structural distortion decreases with Sr doping. Furthermore, it is found that Sr doping results in decrease of the resistivity at room temperature and increase of magnetoresistance. In samples, the same ratio of Mn3+ to Mn4+ is kept. So we would rather attribute these changes to the local structural distortion than the double exchange (DE) interaction. The local structural distortion of the Mn(Fe)O6 octahedron which results from the Jahn—Teller effect, can localize the conduction electrons. In this regard, we provide another evidence to prove that this Jahn—Teller distortion is an important factor that affects the transport property above Tc besides the DE coupling.

Key words: M?ssbauer spectroscopy, Jahn—Teller distortion, colossal magnetoresistance

中图分类号:  (M?ssbauer effect; other γ-ray spectroscopy)

  • 76.80.+y
61.05.cp (X-ray diffraction) 75.47.Lx (Magnetic oxides) 75.47.Gk (Colossal magnetoresistance) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)