The superconducting gaps in LiFeAs: Joint study of specific heat and ARPES
Abstract
We present specific heat, cP, and ARPES data on single crystals of the stoichiometric superconductor LiFeAs. A pronounced anomaly is found in cP at the superconducting transition. The electronic contribution can be described by two s-type energy gaps with magnitudes of approximately Delta1 = 1.2 meV and Delta2 = 2.6 meV and a normal-state gamma coefficient of 10 mJ/mol K2. All these values are in remarkable agreement with ARPES results.
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