Two-band superconductivity with weak interband coupling in structurally disordered Y5Rh6Sn18

J. Juraszek; Yu. V. Sharlai; M. Konczykowski; A. Ślebarski; T. Cichorek

doi:10.1103/PhysRevB.109.174526

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Two-band superconductivity with weak interband coupling in structurally disordered Y5Rh6Sn18

J. Juraszek, Yu. V. Sharlai, M. Konczykowski, A. Ślebarski, T. Cichorek

DOI 10.1103/PhysRevB.109.174526 · Physical Review B

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Abstract

Temperature variation of the lower critical field Hc1(T) in the structurally disordered superconductor Y5Rh6Sn18 with a transition temperature Tc≃3.2 K was investigated using micro-Hall-probe magnetometry for local magnetization measurements. Down to about 0.45Tc, an Hc1(T) dependence typical for a single-band s-wave BCS superconductor was observed. However, deep within the superconducting state, a sudden increase of Hc1(T) was found, indicating the presence of a two-band effect. By applying the two-gap γ model to Y5Rh6Sn18, we revealed a very weak interband coupling in this skutterudite-related material. We speculate that the two-band superconductivity in Y5Rh6Sn18 is a base for the boosted Tc in slightly doped samples, which likely reflects a mechanism for enhancing superconductivity by disorder.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y5Rh6Sn18 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.17	Pressure not reported	onset
LaRu4As12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	10.4	Pressure not reported	unknown