Specific heat and angle-resolved photoemission spectroscopy study of the superconducting gaps in LiFeAs
U. Stockert, M. Abdel-Hafiez, D. V. Evtushinsky, V. B. Zabolotnyy, A. U. B. Wolter, S. Wurmehl, I. Morozov, R. Klingeler, S. V. Borisenko, B. Büchner
DOI 10.1103/PhysRevB.83.224512 · Physical Review B
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Abstract
We present specific-heat, cp, and angle-resolved photoemission spectroscopy (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 Δ1=1.2 meV and Δ2=2.6 meV and a normal-state γ coefficient of 10 mJ/mol K2. All these values are in agreement with ARPES results.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.7 | Pressure not reported | midpoint |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16.9 | Pressure not reported | onset |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
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