Two-gap superconductivity in Mo8Ga41 and its evolution upon vanadium substitution

V. Yu. Verchenko; R. Khasanov; Z. Guguchia; A. A. Tsirlin; A. V. Shevelkov

doi:10.1103/PhysRevB.96.134504

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Two-gap superconductivity in Mo8Ga41 and its evolution upon vanadium substitution

V. Yu. Verchenko, R. Khasanov, Z. Guguchia, A. A. Tsirlin, A. V. Shevelkov

DOI 10.1103/PhysRevB.96.134504 · Physical Review B

T1

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Abstract

Zero-field and transverse-field muon spin rotation/relaxation (μSR) experiments were undertaken in order to elucidate the microscopic properties of a strongly coupled superconductor Mo8Ga41 with Tc=9.8 K. The upper critical field extracted from the transverse-field μSR data exhibits significant reduction with respect to the data from thermodynamic measurements indicating the coexistence of two independent length scales in the superconducting state. Accordingly, the temperature-dependent magnetic penetration depth of Mo8Ga41 is described using a model in which two s wave superconducting gaps are assumed. A V for Mo substitution in the parent compound leads to the complete suppression of one superconducting gap, and Mo7VGa41 is well described within the single s wave gap scenario. The reduction in the superfluid density and the evolution of the low-temperature resistivity upon V substitution indicate the emergence of a competing state in Mo7VGa41 that may be responsible for the closure of one of the superconducting gaps.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo8Ga41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.8	Pressure not reported	unknown
Mo8Ga41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	9.7	Pressure not reported	unknown
Mo7VGa41 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Mo6Ga31 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8	Pressure not reported	unknown
ReGa5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.3	Pressure not reported	unknown
Rh2Ga9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.9	Pressure not reported	unknown
Ir2Ga9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.2	Pressure not reported	unknown