中国物理B ›› 2005, Vol. 14 ›› Issue (9): 1896-1899.doi: 10.1088/1009-1963/14/9/038

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Floating zone growth and magnetic and specific heat properties of La0.67Ca0.33Mn1-xFexO3 (x=0.00, 0.04) single crystals

寇志起, 马骁, 邸乃力, 李庆安, 成昭华   

  1. State Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences,Beijing 100080,China
  • 收稿日期:2005-03-16 修回日期:2005-05-25 出版日期:2005-09-20 发布日期:2005-09-20

Floating zone growth and magnetic and specific heat properties of La0.67Ca0.33Mn1-xFexO3 (x=0.00, 0.04) single crystals

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

  1. State Key Laboratory of Magnetism,Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Received:2005-03-16 Revised:2005-05-25 Online:2005-09-20 Published:2005-09-20

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摘要： Single crystals of La0.67Ca0.33MnO3 and La0.67Ca0.33Mn0.96Fe0.04O3 were obtained by floating zone method. Laue diffraction pattern and rocking curve of the single crystals show that their quality is good. The magnetic behaviours of these compounds have been studied. Fe doping significantly depresses the magnetic contribution to the total specific heat CP, but slightly influences the lattice contribution at temperatures above 50K. The peak of CP shifts towards high temperatures with increasing magnetic field. Both single crystals exhibit the first-order magnetic transition around the Curie temperature.

关键词: perovskite manganite, floating zone method, specific heat

Abstract: Single crystals of La0.67Ca0.33MnO3 and La0.67Ca0.33Mn0.96Fe0.04O3 were obtained by floating zone method. Laue diffraction pattern and rocking curve of the single crystals show that their quality is good. The magnetic behaviours of these compounds have been studied. Fe doping significantly depresses the magnetic contribution to the total specific heat CP, but slightly influences the lattice contribution at temperatures above 50K. The peak of CP shifts towards high temperatures with increasing magnetic field. Both single crystals exhibit the first-order magnetic transition around the Curie temperature.

Key words: perovskite manganite, floating zone method, specific heat

中图分类号:  (Growth from melts; zone melting and refining)

  • 81.10.Fq
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 75.40.Cx (Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)) 75.47.Gk (Colossal magnetoresistance)