中国物理B ›› 2004, Vol. 13 ›› Issue (5): 746-749.doi: 10.1088/1009-1963/13/5/029

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Spin-glass state and ferromagnetic order in Cu(II)－Fe(III) cyanides

戴耀东1, 黄红波2, 林俊2, 夏元复2, 何云3   

  1. (1)College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China; (2)Department of Physics, Nanjing University, Nanjing 210093, China; (3)Department of Physics, Nanjing University, Nanjing 210093, China; College Physics and Information Technology, Guangxi Normal University 541004, China
  • 收稿日期:2003-07-24 修回日期:2003-11-18 出版日期:2004-05-06 发布日期:2005-07-06
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 19835050).

Spin-glass state and ferromagnetic order in Cu(II)－Fe(III) cyanides

He Yun (何云)ab, Dai Yao-Dong (戴耀东)c, Huang Hong-Bo (黄红波)a, Lin Jun (林俊)a, Hsia Yuan-Fu (夏元复)a   

  1. a Department of Physics, Nanjing University, Nanjing 210093, China; b Department of Physics, Nanjing University, Nanjing 210093, China; College Physics and Information Technology, Guangxi Normal University 541004, China; c College of Material Science and Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2003-07-24 Revised:2003-11-18 Online:2004-05-06 Published:2005-07-06
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 19835050).

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摘要： The static and dynamic magnetic properties of a Prussian blue analogue, molecular magnet Cu^Ⅱ_{3}[Fe^Ⅲ(CN)_6]_2·3NH_3·6H_2O were investigated in detail. The H dependence of the linear AC susceptibility, the irreversibility in the field-cooled (FC)/zero-field-cooled (ZFC) magnetization (M_{FC}/M_{ZFC}) and the relaxation of M_{ZFC} suggest that the magnetic system can be visualized as containing a ferromagnetic cluster of spin below T_C, mixed with small spin-glass clusters formed below temperature T_g less than T_C. The observed magnetic properties are explained with a ferromagnetic-spin-glass phase model. The magnetic ordering of the sample occurs below 19.8K.

关键词: spin glass, exchange interaction, ferromagnetic interaction, magnetic Prussian blues

Abstract: The static and dynamic magnetic properties of a Prussian blue analogue, molecular magnet Cu$^{\rm Ⅱ}_{3}$[Fe$^{\rm Ⅲ}$(CN)$_6$]$_2$$\cdot$3NH$_3$$\cdot$6H$_2$O were investigated in detail. The H dependence of the linear AC susceptibility, the irreversibility in the field-cooled (FC)/zero-field-cooled (ZFC) magnetization (MFC/MZFC) and the relaxation of MZFC suggest that the magnetic system can be visualized as containing a ferromagnetic cluster of spin below TC, mixed with small spin-glass clusters formed below temperature Tg less than TC. The observed magnetic properties are explained with a ferromagnetic-spin-glass phase model. The magnetic ordering of the sample occurs below 19.8K.

Key words: spin glass, exchange interaction, ferromagnetic interaction, magnetic Prussian blues

中图分类号:  (Spin glasses and other random magnets)

  • 75.50.Lk
75.50.Dd (Nonmetallic ferromagnetic materials) 75.30.Et (Exchange and superexchange interactions)