Evidence for multiple gaps in specific heat of LiFeAs crystals
F. Wei (1), F. Chen (1), K. Sasmal (1), B. Lv (2), Z. J. Tang (2), Y., Y. Xue (1), A. M. Guloy (2), and C. W. Chu (1, 3, 4) ((1) Department of, Physics, TCSUH, University of Houston, Houston TX, (2) Department of, Chemistry, TCSUH, University of Houston, Houston TX, (3) LBNL
TL;DR
This study measures the specific heat of LiFeAs crystals, revealing evidence for multiple superconducting gaps and providing insights into its electronic properties and comparison with related compounds.
Contribution
The paper presents the first detailed specific heat measurements of LiFeAs, identifying multiple gaps and comparing these findings with other iron-based superconductors.
Findings
Observation of a sharp specific heat anomaly at Tc
Identification of a two-gap structure with a narrow gap around 0.7 meV
Results are consistent with some previous measurements but differ from others
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.
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