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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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.

Original languageEnglish
Article number134527
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number13
Publication statusPublished - 2010 Apr 28

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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