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Evidence for s(+/-)-wave pairing symmetry in LiFeAs from its low-temperature specific heat

Title
Evidence for s(+/-)-wave pairing symmetry in LiFeAs from its low-temperature specific heat
Authors
Jang, Dong-JinHong, J. B.Kwon, Y. S.Park, T.Gofryk, K.Ronning, F.Thompson, J. D.Bang, Yunkyu
DGIST Authors
Kwon, Y. S.
Issue Date
2012-05-18
Citation
Physical Review B: Condensed Matter and Materials Physics, 85(18)
Type
Article
Article Type
Article
ISSN
2469-9950
Abstract
We report specific heat capacity measurements on a LiFeAs single crystal at temperatures down to 400 mK and magnetic fields up to 9 T. A small specific heat jump at T c and finite residual density of states at T=0 K in the superconducting (SC) state indicate that there are strong unitary scatterers that lead to states within the SC gap. A sublinear magnetic field dependence of the Sommerfeld coefficient γ(H) at T=0 K is equally well fitted by both a nodal d-wave gap as well as a sign changing multiband s ±-wave gap. When impurity effects are taken into account, however, the linear temperature dependence of the electronic specific heat C el/T at low temperatures argues against a nodal d-wave superconducting gap. We conclude that the SC state of LiFeAs is most compatible with the multiband s ±-wave SC state with the gap values Δ small=0. 46Δ large. © 2012 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/5361
DOI
10.1103/PhysRevB.85.180505
Publisher
American Physical Society
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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