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

Article

关键词: CRITICAL MAGNETIC-FIELD;    INSULATOR TRANSITION;    2-DIMENSIONAL SUPERCONDUCTORS;    ULTRATHIN FILMS;    LOW-TEMPERATURE;    MAGNETOTRANSPORT;    DEPENDENCE;    RESISTANCE;    2D;   

DOI  :  10.1103/PhysRevB.87.064512

来源: SCIE

【 摘 要 】

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. DOI: 10.1103/PhysRevB.87.064512

【 授权许可】

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