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Magnetic phase transitions and large mass enhancement in single crystal CaFe_4 As_3
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作者 Zhang Xiao-Dong Wu Wei +1 位作者 Zheng Ping Luo Jian-Lin 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第1期12-17,共6页
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... 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. 展开更多
关键词 antiferromagnetic ordering transition ferromagnetic ordering transition canted antifer-romagnetic state
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