中国物理B ›› 2005, Vol. 14 ›› Issue (1): 192-195.doi: 10.1088/1009-1963/14/1/035

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Effects of Gd substitution on magnetic and transport properties in La0.6-xGdxSr1.4MnO4

马骁, 鲁毅, 寇志起, 邸乃力, 成昭华, 李庆安   

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • 收稿日期:2004-03-19 修回日期:2004-09-01 出版日期:2005-01-20 发布日期:2005-01-20

Effects of Gd substitution on magnetic and transport properties in La0.6-xGdxSr1.4MnO4

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

  1. State Key Laboratory of Magnetism, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2004-03-19 Revised:2004-09-01 Online:2005-01-20 Published:2005-01-20

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摘要： With the increasing of x, the ZFC (zero-field cooling) M-T curves for the polycrystals La0.6-xGdxSr1.4MnO4(x=0, 0.1, 0.2, 0.4,0.6) change from spin-glass-like to paramagnetic, and each ZFC M-T curve has an inflection point at 20K. These behaviours can be understood by considering the respective contributions of Mn and Gd to the total magnetism. In addition, for all the samples, thermal activation conducting behaviours are observed from 100 K to room temperature. Due to the strong antiferromagnetic coupling between neighbouring Mn ions, there is no obvious magnetoresistance effect until the magnetic field strength rises to 3.98$\tm10^6$A/m.

关键词: spin glass, magnetism, antiferromagnetic, magnetoresistance

Abstract: With the increasing of x, the ZFC (zero-field cooling) M-T curves for the polycrystals La0.6-xGdxSr1.4MnO4(x=0, 0.1, 0.2, 0.4,0.6) change from spin-glass-like to paramagnetic, and each ZFC M-T curve has an inflection point at 20K. These behaviours can be understood by considering the respective contributions of Mn and Gd to the total magnetism. In addition, for all the samples, thermal activation conducting behaviours are observed from 100 K to room temperature. Due to the strong antiferromagnetic coupling between neighbouring Mn ions, there is no obvious magnetoresistance effect until the magnetic field strength rises to $3.98\times10^6$A/m.

Key words: spin glass, magnetism, antiferromagnetic, magnetoresistance

中图分类号: 

  • 7170G