Nodeless superconductivity of single-crystalline KxFe2−ySe2 revealed by the low-temperature specific heat
B. Zeng, B. Shen, G. F. Chen, J. B. He, D. M. Wang, C. H. Li, H. H. Wen
DOI 10.1103/PhysRevB.83.144511 · Physical Review B
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Abstract
Low-temperature specific heat (SH) has been measured in KxFe2−ySe2 single crystals with Tc=32 K. The SH anomaly associated with the superconducting transition is moderate and sharp, yielding a value of ΔC/T|Tc=11.6±1.0 mJ/mol K2. The residual SH coefficient γ(0) in the superconducting state at T→0 is very small with a value of about 0.39 mJ/mol K2. The magnetic-field-induced enhancement of the low-T SH exhibits a rough linear feature indicating a nodeless gap. This is further supported by the scaling based on the nodeless-gap approach of the low-T data at different magnetic fields. A rough estimate indicates that the normal-state SH coefficient γn is about 6±0.5 mJ/mol K2, leading to ΔC/γnT|Tc=1.93 and placing this superconductor in the strong coupling region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
| KxFe2-ySe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | onset |
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