Journal
PHYSICAL REVIEW B
Volume 81, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.81.134527
Keywords
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Funding
- U.S. Air Force Office of Scientific Research
- T. L. L. Temple Foundation
- John J. and Rebecca Moores Endowment
- Robert A. Welch Foundation [E-1297]
- State of Texas through the Texas Center for Superconductivity at the University of Houston
- U.S. Department of Energy [DE-AC03-76SF00098]
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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 C(p)/T(c) anomaly approximate to 20 mJ/mole K(2) was observed. The value appears to be between those of SmFeAs(O(0.9)F(0.1)) and (Ba(0.6)K(0.4))Fe(2)As(2) 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))Fe(2)As(2), they are different from the published specific-heat data of a (Ba(0.6)K(0.4))Fe(2)As(2) single crystal.
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