中国物理B ›› 2003, Vol. 12 ›› Issue (7): 789-791.doi: 10.1088/1009-1963/12/7/316

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Magnetic properties of Nd0.5Pb0.5-xSrxMnO3 materials

鲁毅, 李庆安, 邸乃力, 马骁, 寇志起, 罗志, 成昭华   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2002-12-26 修回日期:2003-04-08 出版日期:2003-07-16 发布日期:2005-03-16

Magnetic properties of Nd0.5Pb0.5-xSrxMnO3 materials

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

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2002-12-26 Revised:2003-04-08 Online:2003-07-16 Published:2005-03-16

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摘要： The structure and magnetic properties of Nd_{0.5}Pb_{0.5-x}Sr_xMnO_3 (0≤x≤0.4) manganites were systematically investigated. Significant changes in Curie temperature and metal-insulator (MI) transition temperature of the samples were observed. All samples exhibited a transition from paramagnetic semiconducting to ferromagnetic metallic state. Curie temperature T_C and the MI transition temperature T_p increased with increasing Sr content. We attributed these behaviours to the enhancing of both the double exchange mechanism and the Jahn－Teller electron－phonon coupling.

Abstract: The structure and magnetic properties of Nd0.5Pb0.5-xSrxMnO3 (0≤x≤0.4) manganites were systematically investigated. Significant changes in Curie temperature and metal-insulator (MI) transition temperature of the samples were observed. All samples exhibited a transition from paramagnetic semiconducting to ferromagnetic metallic state. Curie temperature TC and the MI transition temperature Tp increased with increasing Sr content. We attributed these behaviours to the enhancing of both the double exchange mechanism and the Jahn－Teller electron－phonon coupling.

Key words: structure, magnetic properties, double exchange interaction, transition temperature Tp, Jahn－Teller distortion, neutron diffraction.

中图分类号:  (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))

  • 75.30.Kz
75.30.Et (Exchange and superexchange interactions) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)) 71.30.+h (Metal-insulator transitions and other electronic transitions) 71.70.Ej (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)