Evidence for multiple gaps in specific heat of LiFeAs crystals

F. Wei; F. Chen; K. Sasmal; B. Lv; Z. J. Tang; Y. Y. Xue; A. M. Guloy; C. W. Chu

doi:10.1103/PhysRevB.81.134527

Evidence for multiple gaps in specific heat of LiFeAs crystals

Superconductivity 2011-05-06 v1

Authors: F. Wei , F. Chen , K. Sasmal , B. Lv , Z. J. Tang , Y. Y. Xue , A. M. Guloy , C. W. Chu

View on arXiv ↗ PDF ↗ DOI ↗

Abstract

The zero-field specific heat of LiFeAs was measured on several single crystals selected from a bulk sample. A sharp Delta Cp/Tc anomaly of approximately 20 mJ/(mole x K^2) was observed. The value appears to be between those of SmFeAs(O0.9F0.1) and (Ba0.6K0.4)Fe2As2, but bears no clear correlation with their Sommerfeld coefficients. The electronic specific heat below Tc further reveals a two-gap structure with the narrower one only on the order of 0.7 meV. While the results are in rough agreement with the Hc1(T) previously reported on both LiFeAs and (Ba0.6K0.4)Fe2As2, they are different from the published specific-heat data of a (Ba0.6K0.4)Fe2As2 single crystal.

Keywords

LiFeAs specific heat multiple gaps superconductor two-gap structure

Cite

@article{arxiv.1004.0854,
  title  = {Evidence for multiple gaps in specific heat of LiFeAs crystals},
  author = {F. Wei and F. Chen and K. Sasmal and B. Lv and Z. J. Tang and Y. Y. Xue and A. M. Guloy and C. W. Chu},
  journal= {arXiv preprint arXiv:1004.0854},
  year   = {2011}
}

Comments

19 pages, 5 figures

Evidence for multiple gaps in specific heat of LiFeAs crystals

Abstract

Keywords

Cite

Comments

Related papers