Evidence of nodeless superconductivity in FeSe0.85 from a muon-spin-rotation study of the in-plane magnetic penetration depth

R. Khasanov; K. Conder; E. Pomjakushina; A. Amato; C. Baines; Z. Bukowski; J. Karpinski; S. Katrych; H.-H. Klauss; H. Luetkens; A. Shengelaya; N. D. Zhigadlo

doi:10.1103/PhysRevB.78.220510

Evidence of nodeless superconductivity in FeSe0.85 from a muon-spin-rotation study of the in-plane magnetic penetration depth

R. Khasanov, K. Conder, E. Pomjakushina, A. Amato, C. Baines, Z. Bukowski, J. Karpinski, S. Katrych, H.-H. Klauss, H. Luetkens, A. Shengelaya, N. D. Zhigadlo

DOI 10.1103/PhysRevB.78.220510 · Physical Review B

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Abstract

The in-plane magnetic penetration depth λab of the iron selenide superconductor with the nominal composition FeSe0.85 was studied by means of muon-spin rotation. The measurements of λab−2(T) are inconsistent with a simple isotropic s-wave type of the order parameter but are rather in favor of two-gap (s+s) and anisotropic s-wave order parameter symmetries, thus implying that the superconducting energy gap in FeSe0.85 contains no nodes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
FeSe0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.26	Pressure not reported	unknown
FeSe0.85 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.3	Pressure not reported	unknown
FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown