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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Abstract

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
Volume82
Issue number5
DOIs
Publication statusPublished - 2013 May 1

Keywords

  • 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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    Mu, G., Tang, J., Tanabe, Y., Xu, J., Zeng, B., Shen, B., Han, F., Wen, H. H., Heguri, S., & Tanigaki, K. (2013). A field-directional specific heat study on the gap structure of overdoped Ba(Fe1-xCox)2As2. journal of the physical society of japan, 82(5), [054714]. https://doi.org/10.7566/JPSJ.82.054714