Anomalous metallic state above the upper critical field of the conventional three-dimensional superconductor AgSnSe2 with strong intrinsic disorder

Abstract

We report superconducting properties of AgSnSe2 which is a conventional type-II superconductor in the very dirty limit due to intrinsically strong electron scatterings. While this material is an isotropic three-dimensional (3D) superconductor with a not-so-short coherence length where strong vortex fluctuations are NOT expected, we found that the magnetic-field-induced resistive transition at fixed temperatures becomes increasingly broader toward zero temperature and, surprisingly, that this broadened transition is taking place largely ABOVE the upper critical field determined thermodynamically from the specific heat. This result points to the existence of an anomalous metallic state possibly caused by quantum phase fluctuations in a strongly-disordered 3D superconductor.

arXiv comment6 pages, 6 figures; accepted for publication in PRB

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Cited by in corpus (12)

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• Superconductivity in High-Entropy-Alloy Telluride AgInSnPbBiTe5
• Quantum meets classical phase transition: Low-temperature anomaly in disordered superconductors near $B_{c2}$
• Evolution of electronic states and emergence of superconductivity in the polar semiconductor GeTe by doping valence-skipping In
• Evidence for s-wave Pairing with Atomic Scale Disorder in the van der Waals Superconductor NaSn2As2
• Face centered cubic SnSe as a ${\mathbb{Z}}_2$ trivial Dirac nodal line material
• Superconducting ground state study of valence skip compound AgSnSe${}_2$
• Bi Substitution Effects on Superconductivity of Valence-Skip superconductor AgSnSe2
• High-pressure synthesis and superconducting properties of NaCl-type In1-xPbxTe (x = 0-0.8)
• Superconductivity, valence-skipping and topological crystalline metal in AgSnSe${}_2$
• Probing Mixed Valence States by Nuclear Spin-Spin Relaxation Time Measurements