The superconducting gaps in LiFeAs: Joint study of specific heat and ARPES

U. Stockert , M. Abdel-Hafiez , D. V. Evtushinsky , V. B. Zabolotnyy , A. U. B. Wolter , S. Wurmehl , I. Morozov , R. Klingeler

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S. V. Borisenko B. B\"uchner

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classification ❄️ cond-mat.supr-con

keywords arpesgapsheatlifeasspecificsuperconductingagreementanomaly

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We present specific heat, c_P, and ARPES data on single crystals of the stoichiometric superconductor LiFeAs. A pronounced anomaly is found in c_P 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 K^2. All these values are in remarkable agreement with ARPES results.

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The superconducting gaps in LiFeAs: Joint study of specific heat and ARPES

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