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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Verchenko V. Yu, Verchenko V. Yu, Khasanov R., Guguchia Z., Tsirlin A. A., Shevelkov A. V.,
Project Interplay between the superconductivity and magnetism in cuprate and Fe-based superconductors
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Original article (peer-reviewed)

Journal Physical Review B
Volume (Issue) 96(13)
Page(s) 134504
Title of proceedings Physical Review B
DOI 10.1103/physrevb.96.134504

Abstract

© 2017 American Physical Society. 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.
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