A field-directional specific heat study on the gap structure of overdoped Ba(Fe1-xCox)2As2

Gang Mu, Jun Tang, Yoichi Tanabe, Jingtao Xu, Bin Zeng, Bing Shen, Fei Han, Hai Hu Wen, Satoshi Heguri, Katsumi Tanigaki

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1 Citation (Scopus)


Lowerature specific heat is measured on the overdoped Ba(Fe 1-xCox)2As2 (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 γ(H). The value of γ(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.

Original languageEnglish
Article number054714
Journaljournal of the physical society of japan
Issue number5
Publication statusPublished - 2013 May


  • Ba(fe Co)as
  • Fe-based superconductors
  • Gap structure
  • Line nodes
  • Specific heat

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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