Calorimetric evidence of strong-coupling multiband superconductivity in Fe(Te0.57Se0.43) single crystal
J. Hu, T. J. Liu, B. Qian, A. Rotaru, L. Spinu, Z. Q. Mao
DOI 10.1103/PhysRevB.83.134521 · Physical Review B
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Abstract
We have investigated the specific heat of optimally doped iron chalcogenide superconductor Fe(Te0.57Se0.43) with a high-quality single crystal sample. The electronic specific heat Ce of this sample has been successfully separated from the phonon contribution using the specific heat of a nonsuperconducting sample (Fe0.90Cu0.10)(Te0.57Se0.43) as a reference. The normal-state Sommerfeld coefficient γn of the superconducting sample is found to be ~26.6 mJ/mol K2, indicating intermediate electronic correlation. The temperature dependence of Ce in the superconducting state can be best fitted using a double-gap model with 2Δs(0)/kBTc=3.92 and 2Δl(0)/kBTc=5.84. The large gap magnitudes derived from fitting, as well as the large specific heat jump of ΔCe(Tc)/γnTc~2.11, indicate strong-coupling superconductivity. Furthermore, the magnetic field dependence of specific heat shows strong evidence for multiband superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Fe(Te0.57Se0.43) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.7 | Pressure not reported | onset |
| Fe(Te0.57Se0.43) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | unknown |
| Fe(Te0.57Se0.43) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14 | Pressure not reported | unknown |
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