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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)† |
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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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.
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Received: 11 October 2011
Revised: 20 October 2011
Accepted manuscript online:
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PACS:
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74.70.-b
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(Superconducting materials other than cuprates)
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75.30.-m
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(Intrinsic properties of magnetically ordered materials)
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72.15.Eb
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(Electrical and thermal conduction in crystalline metals and alloys)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. Y1JA011x11). |
Cite this article:
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) Magnetic phase transitions and large mass enhancement in single crystal CaFe4As3 2012 Chin. Phys. B 21 017402
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