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

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 redu...

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Bibliographic Details
Published in:Physical review. B 2017-10, Vol.96 (13)
Main Authors: Verchenko, V Yu, Khasanov, R, Guguchia, Z, Tsirlin, A A, Shevelkov, A V
Format: Article
Language:English
Subjects:
Critical field (superconductivity)
Evolution
Fluids
Muon spin relaxation
Muon spin rotation
Penetration depth
Reduction
S waves
Substitutes
Superconductivity
Superfluidity
Temperature dependence
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Summary: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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.134504