Evidence for multiple gaps in the 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 the 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

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摘要

The zero-field specific heat of LiFeAs was measured on several single crystals selected from a bulk sample. A sharp Δ C_p / T _c anomaly ≈ 20 mJ/mole K² was observed. The value appears to be between those of SmFeAs (O_0.9 F_0.1) and (Ba_0.6 K_0.4) Fe₂ As₂ but bears no clear correlation with their Sommerfeld coefficients. The electronic specific heat below T_c 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 H_c1(T) previously reported on both LiFeAs and (Ba_0.6 K_0.4) Fe₂ As₂, they are different from the published specific-heat data of a (Ba_0.6 K0_.4) Fe ₂ As₂ single crystal.

原文	English
文章編號	134527
期刊	Physical Review B - Condensed Matter and Materials Physics
卷	81
發行號	13
DOIs	https://doi.org/10.1103/PhysRevB.81.134527
出版狀態	Published - 2010 4月 28

All Science Journal Classification (ASJC) codes

電子、光磁材料
凝聚態物理學

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10.1103/PhysRevB.81.134527

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AU - Wei, F.

AU - Chen, F.

AU - Sasmal, K.

AU - Lv, B.

AU - Tang, Z. J.

AU - Xue, Y. Y.

AU - Guloy, A. M.

AU - Chu, C. W.

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N2 - The zero-field specific heat of LiFeAs was measured on several single crystals selected from a bulk sample. A sharp Δ Cp / T c anomaly ≈ 20 mJ/mole K2 was observed. The value appears to be between those of SmFeAs (O0.9 F0.1) and (Ba0.6 K0.4) Fe2 As2 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 (Ba0.6 K0.4) Fe2 As2, they are different from the published specific-heat data of a (Ba0.6 K0.4) Fe 2 As2 single crystal.

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Evidence for multiple gaps in the specific heat of LiFeAs crystals

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