Quadrupling the depairing current density in the iron-based superconductor SmFeAsO_1-xH_x.

ABSTRACT: Iron-based 1111-type superconductors display high critical temperatures and relatively high critical current densities J_c. The typical approach to increasing J_c is to introduce defects to control dissipative vortex motion. However, when optimized, this approach is theoretically predicted to be limited to achieving a maximum J_c of only ∼30% of the depairing current density J_d, which depends on the coherence length and the penetration depth. Here we dramatically boost J_c in SmFeAsO_1-xH_x films using a thermodynamic approach aimed at increasing J_d and incorporating vortex pinning centres. Specifically, we reduce the penetration depth, coherence length and critical field anisotropy by increasing the carrier

SUBMITTER: Miura M 

PROVIDER: S-EPMC11442304 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature