Two-gap superconductivity in Mo${}_8$Ga${}_{41}$ and its evolution upon the V substitution

Abstract

Zero-field and transverse-field muon spin rotation/relaxation ($\mu$SR) experiments were undertaken in order to elucidate microscopic properties of a strongly-coupled superconductor Mo${}_8$Ga${}_{41}$ with $T_{\text{c}}=9.8$ K. The upper critical field extracted from the transverse-field $\mu$SR 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 Mo${}_8$Ga${}_{41}$ is described using the model, in which two s-wave superconducting gaps are assumed. The V for Mo substitution in the parent compound leads to the complete suppression of one superconducting gap, and Mo${}_7$VGa${}_{41}$ 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 the V substitution indicate the emergence of a competing state in Mo${}_7$VGa${}_{41}$ that may be responsible for the closure of one of the superconducting gaps.

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Cited by in corpus (8)

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• Multi-band superconductivity driven by a site-selective mechanism in Mo${}_8$Ga${}_{41}$
• Mo${}_6$Ga${}_{31}$ endohedral cluster superconductor
• Three-dimensional Fermi surface and small effective masses in Mo8Ga41
• Linear magnetoresistance with a universal energy scale in a strong-coupling superconductor
• Superconductivity in Mo${}_4$Ga${}_{20}$As with Endohedral Gallium Clusters
• Conventional s-wave superconductivity and hidden peak effect in single crystals of Mo${}_8$Ga${}_{4}1$ superconductor
• Single-gap superconductivity in Mo${}_8$Ga${}_{41}$