A Field-Directional Specific Heat Study on the Gap Structure of Overdoped Ba(Fe
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概要
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Low-temperature specific heat is measured on the overdoped Ba(Fe<inf>1-x</inf>Co<inf>x</inf>)<inf>2</inf>As<inf>2</inf>(x = 0.13) single crystal under magnetic fields along three different directions. A clear anisotropy is observed on the field dependent electronic specific heat coefficient \gamma(H). The value of \gamma(H) is obviously larger with magnetic field along [001] (c-axis) than that within the ab-plane of the crystal lattice, which cannot be attributed to the effect by anisotropy of the upper critical field. Meanwhile, the data show a rather small difference when the direction of the field is rotated from [100] to [110] direction within the ab-plane. Our results suggest that a considerable part of the line nodes is not excited to contribute to the quasiparticle density of states by the field when the field is within the ab-plane. The constraints on the topology of the gap nodes are discussed based on our observations.
- 2013-05-15
著者
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Tanigaki Katsumi
Department Of Physics Graduate School Of Science Tohoku Univ.:wpi Tohoku Univ.
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Wen Hai-hu
Institude Of Physics Chinese Academy Of Science
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Heguri Satoshi
Department of Physics, Graduate School of Science, Tohoku University
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Tang Jun
WPI-AIMR, Tohoku Univ.
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Tanabe Yoichi
WPI-AIMR Tohoku Univ.
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Xu Jingtao
WPI-AIMR Tohoku Univ.
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Mu Gang
Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Tang Jun
WPI-AIMR, Tohoku University, Sendai 980-8578, Japan
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Zeng Bin
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
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Shen Bing
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
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Han Fei
Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100190, China
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Tanabe Yoichi
WPI-AIMR, Tohoku University, Sendai 980-8578, Japan
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