Evidence for multiple gaps in specific heat of LiFeAs crystals

(2) Department of Chemistry; 3; (3) LBNL; 4) ((1) Department of Physics; (4) HKUST; A. M. Guloy (2); Berkeley CA; B. Lv (2); China); C. W. Chu (1

arxiv: 1004.0854 · v1 · pith:E42CYTAMnew · submitted 2010-04-06 · ❄️ cond-mat.supr-con

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) , C. W. Chu (1

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3 4) ((1) Department of Physics TCSUH University of Houston Houston TX (2) Department of Chemistry (3) LBNL Berkeley CA (4) HKUST Hong Kong China)

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keywords fe2as2heatlifeasspecificcrystalssingleagreementanomaly

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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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Evidence for multiple gaps in specific heat of LiFeAs crystals

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