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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42 引文 斯高帕斯(Scopus)

摘要

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.

原文English
文章編號134527
期刊Physical Review B - Condensed Matter and Materials Physics
81
發行號13
DOIs
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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