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We report superconducting properties of AgSnSe2 which is a conventionaltype-II superconductor in the very dirty limit due to intrinsically strongelectron scatterings. While this material is an isotropic three-dimensional(3D) superconductor with a not-so-short coherence length where strong vortexfluctuations are NOT expected, we found that the magnetic-field-inducedresistive transition at fixed temperatures becomes increasingly broader towardzero temperature and, surprisingly, that this broadened transition is takingplace largely ABOVE the upper critical field determined thermodynamically fromthe specific heat. This result points to the existence of an anomalous metallicstate possibly caused by quantum phase fluctuations in a strongly-disordered 3Dsuperconductor.

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