中国物理B ›› 2012, Vol. 21 ›› Issue (1): 17402-017402.doi: 10.1088/1674-1056/21/1/017402

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Magnetic phase transitions and large mass enhancement in single crystal CaFe4As3

张晓冬, 吴伟, 郑萍, 王楠林, 雒建林   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • 收稿日期:2011-10-11 修回日期:2011-10-20 出版日期:2012-01-15 发布日期:2012-01-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. Y1JA011x11).

Magnetic phase transitions and large mass enhancement in single crystal CaFe4As3

Zhang Xiao-Dong(张晓冬), Wu Wei(吴伟), Zheng Ping(郑萍), Wang Nan-Lin(王楠林), and Luo Jian-Lin(雒建林)   

  1. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
  • Received:2011-10-11 Revised:2011-10-20 Online:2012-01-15 Published:2012-01-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. Y1JA011x11).

摘要: High quality single crystal CaFe4As3 was grown by using the Sn flux method. Unlike layered CaFe2As2, CaFe4As3 crystallizes in an orthorhombic three-dimensional structure. Two magnetic ordering transitions are observed at ~90 K and ~27 K, respectively. The high temperature transition is an antiferromagnetic(AF) ordering transition. However, the low temperature transition shows complex properties. It shows a ferromagnetic-like transition when a field is applied along b-axis, while antiferromagnetism-like transition when a field is applied perpendicular to b-axis. These results suggest that the low temperature transition at 27 K is a first-order transition from an AF state to a canted AF state. In addition, the low temperature electron specific heat coefficient reaches as high as 143 mJ/mol·K2, showing a heavy fermion behavior.

关键词: antiferromagnetic ordering transition, ferromagnetic ordering transition, canted antiferromagnetic state

Abstract: High quality single crystal CaFe4As3 was grown by using the Sn flux method. Unlike layered CaFe2As2, CaFe4As3 crystallizes in an orthorhombic three-dimensional structure. Two magnetic ordering transitions are observed at ~90 K and ~27 K, respectively. The high temperature transition is an antiferromagnetic(AF) ordering transition. However, the low temperature transition shows complex properties. It shows a ferromagnetic-like transition when a field is applied along b-axis, while antiferromagnetism-like transition when a field is applied perpendicular to b-axis. These results suggest that the low temperature transition at 27 K is a first-order transition from an AF state to a canted AF state. In addition, the low temperature electron specific heat coefficient reaches as high as 143 mJ/mol·K2, showing a heavy fermion behavior.

Key words: antiferromagnetic ordering transition, ferromagnetic ordering transition, canted antiferromagnetic state

中图分类号:  (Superconducting materials other than cuprates)

  • 74.70.-b
75.30.-m (Intrinsic properties of magnetically ordered materials) 72.15.Eb (Electrical and thermal conduction in crystalline metals and alloys)