中国物理B ›› 1998, Vol. 7 ›› Issue (5): 354-360.doi: 10.1088/1004-423X/7/5/006

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MAGNETIC PROPERTIES OF Pr2Co17-x Mx ( M＝Ga,Si) COMPOUNDS

张立刚1, 张绍英2, 沈保根2, 李润伟2, 梁兵2, 张宏伟2, 成昭华2, 王芳卫2, 詹文山2   

  1. (1)Department of Basic Science, University of Metallurgical Science and Technology of Wuhan; (2)State Key Laboratory of Magnetism,Institute of Physics and Center for Condensed Matter Physics, Academia Sinica, Beijing 100080, China
  • 收稿日期:1997-08-04 修回日期:1997-12-12 出版日期:1998-05-20 发布日期:1998-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China.

MAGNETIC PROPERTIES OF Pr2Co17-x Mx ( M＝Ga,Si) COMPOUNDS

ZHANG SHAO-YING (张绍英)a, SHEN BAO-GEN (沈保根)a, LI RUN-WEI (李润伟)a, LIANG BING (梁兵)a, ZHANG HONG-WEI (张宏伟)a, CHENG ZHAO-HUA (成昭华)a, WANG FANG-WEI (王芳卫)a, ZHAN WEN-SHAN (詹文山)a, ZHANG LI-GANG (张立刚)b   

  1. a State Key Laboratory of Magnetism,Institute of Physics and Center for Condensed Matter Physics, Academia Sinica, Beijing 100080, China; b Department of Basic Science, University of Metallurgical Science and Technology of Wuhan, Wuhan 430081, China
  • Received:1997-08-04 Revised:1997-12-12 Online:1998-05-20 Published:1998-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China.

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摘要： The influence of Ga or Si substitution for Co on the structural and magnetic properties of Pr2Co17 compounds is investigated. All samples studied here are single phase and have the rhombohedral Th2Zn17-type structure. The unit-cell volume is found to increase linearly by the substitution of Ga for Co,but reduce by the substitution of Si for Co in Pr2Co17 compounds. In Pr2Co17-x Mx, the Curie temperature decreases monoto nically with increasing at an approximate rate of 153K per Ga atom and 175K per Si atom. The saturation magnetic moment of Pr2Co17-x Mx ( M=Ga,Si) decreases with increasing x. The rates of the decrease are larger than that expected as a simple dilution. For Pr2Co17-xSix ,the spin reorientation transition is observed above room temperature. The spin-reorientation temperature Tsrfirst decreases with increasing Si content and then increases at higher x values (x>2). The spin reorientat ion behavior is interpreted by the competition between the Pr and Co sublattice anisotropies. The easy magnetization direction in Pr2Co17-xGax compounds is perpendicular to the c-axis, and no spin reorientation transition is observed.

Abstract: The influence of Ga or Si substitution for Co on the structural and magnetic properties of Pr2Co17 compounds is investigated. All samples studied here are single phase and have the rhombohedral Th2Zn17-type structure. The unit-cell volume is found to increase linearly by the substitution of Ga for Co,but reduce by the substitution of Si for Co in Pr2Co17 compounds. In Pr2Co17-x Mx, the Curie temperature decreases monoto nically with increasing at an approximate rate of 153K per Ga atom and 175K per Si atom. The saturation magnetic moment of Pr2Co17-x Mx ( M=Ga,Si) decreases with increasing x. The rates of the decrease are larger than that expected as a simple dilution. For Pr2Co17-xSix ,the spin reorientation transition is observed above room temperature. The spin-reorientation temperature Tsr first decreases with increasing Si content and then increases at higher x values (x>2). The spin reorientat ion behavior is interpreted by the competition between the Pr and Co sublattice anisotropies. The easy magnetization direction in Pr2Co17-xGax compounds is perpendicular to the c-axis, and no spin reorientation transition is observed.

中图分类号:  (Saturation moments and magnetic susceptibilities)

  • 75.30.Cr
75.30.Kz (Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)) 61.66.Fn (Inorganic compounds) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects) 75.30.Ds (Spin waves)