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.

References in corpus (5)

• Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
• Doping evolution of the absolute value of the London penetration depth and superfluid density in single crystals of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$
• Superconductivity in Rh${}_2$Ga${}_9$ and Ir${}_2$Ga${}_9$ without Inversion Symmetry
• SrPt${}_3$P: two-band single-gap superconductor
• Evolution of London penetration depth with scattering in single crystals of K${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$

Cited by in corpus (3)

• The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor
• Mo${}_6$Ga${}_{31}$ endohedral cluster superconductor
• Three-dimensional Fermi surface and small effective masses in Mo8Ga41