Giant enhancement of critical current density at high field in superconducting (Li,Fe)OHFeSe films by Mn doping

TL;DR

This study demonstrates that Mn doping in (Li,Fe)OHFeSe superconducting films significantly enhances their critical current density and vortex pinning force under high magnetic fields, advancing their potential for high-field applications.

Contribution

The paper introduces Mn doping as an effective method to greatly improve the high-field performance of (Li,Fe)OHFeSe superconducting films, achieving record vortex pinning forces.

Findings

Critical current density increased from 0.03 to 0.32 MA/cm^2 at 33 T

Vortex pinning force density reached 106 GN/m^3, highest among iron-based superconductors

Mn doping effectively enhances high-field superconducting performance

Abstract

Critical current density (Jc) is one of the major limiting factors for high field applications of iron-based superconductors. Here, we report that Mn-ions are successfully incorporated into nontoxic superconducting (Li,Fe)OHFeSe films. Remarkably, the Jc is significantly enhanced from 0.03 to 0.32 MA/cm^2 under 33 T, and the vortex pinning force density monotonically increases up to 106 GN/m^3, which is the highest record so far among all iron-based superconductors. Our results demonstrate that Mn incorporation is an effective method to optimize the performance of (Li,Fe)OHFeSe films, offering a promising candidate for high-field applications.