Routes to probe Bismuth induced strong-coupling superconductivity in bimetallic BiIn alloys.

ABSTRACT: We report the observation of strong electron-phonon coupling in intergranular linked BiIn superconductors over an infinite range mediated by low-lying phonons. An enhanced superconducting transition temperature was observed from the magnetization, revealing a main diamagnetic Meissner state below T_C(0)?=?5.86(1) K and a critical field H_C(0)?=?1355(15) Oe with an In₂Bi phase of the composite sample. The electron-phonon coupling to low lying phonons is found to be the leading mechanism for observed strong-coupling superconductivity in the BiIn system. Our findings suggest that In₂Bi is in the strong-coupling region with T_C(0)?=?5.62(1) K, ?_ep?=?1.45, ?_ln?=?45.92?K and ??=?2.23. The estimated upper critical field can be well-described by a power law with ? value higher than 2, consistent with the strong electron-phonon coupling.

SUBMITTER: Gandhi AC 

PROVIDER: S-EPMC5572680 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature