Evolution of superconducting gaps in Th-substituted Sm1−xThxOFeAs studied by multiple Andreev reflection spectroscopy
T. E. Kuzmicheva, S. A. Kuzmichev, K. S. Pervakov, V. M. Pudalov, N. D. Zhigadlo
DOI 10.1103/PhysRevB.95.094507 · Physical Review B
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Abstract
Using intrinsic multiple Andreev reflections effect spectroscopy, we studied SnS contacts in the layered oxypnictide superconductors Sm1−xThxOFeAs with various thorium doping and critical temperatures TC=21–54 K. We observe a scaling between both superconducting gaps and TC. The determined BCS ratio for the large gap 2ΔL/kBTC=5.0–5.7 and its eigen-BCS ratio (in a hypothetical case of zero interband coupling) 2ΔL/kBTCL=4.1–4.6 both exceeding the weak-coupling limit 3.52, and for the small gap 2ΔS/kBTC=1.2–1.6, remain nearly constant within all the TC range studied. The temperature dependences ΔL,S(T) agree well with a two-band BCS-like Moskalenko and Suhl model. We prove intraband coupling to be stronger than interband coupling, whereas Coulomb repulsion constants μ* are finite in Sm-based oxypnictides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sm1-xThxOFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 54 | Pressure not reported | onset |
| Sm1-xThxOFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| SmOFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 57 | Pressure not reported | unknown |
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