The flux pinning force and vortex phase diagram of single crystal FeTe0.60Se0.40

TL;DR

This study investigates the vortex pinning mechanisms and phase diagram of single crystal FeTe0.60Se0.40, revealing high critical current density and upper critical field, with implications for superconductor performance.

Contribution

First detailed vortex phase diagram and pinning analysis for FeTe0.60Se0.40, identifying mixed surface and point core pinning mechanisms.

Findings

High critical current density (~1.10^5 A/cm^2)

Upper critical field Hc2(0) = 65 T

Transition temperature Tc = 14.5 K

Abstract

The flux pinning force density (Fp) of the single crystalline FeTe0.60Se0.40 superconductor has been calculated from the magnetization measurements. The normalized Fp versus h (=H/Hirr) curves are scaled using the Dew-Hughes formula to underline the pinning mechanism in the compound. The obtained values of pinning parameters p and q indicate the vortex pinning by the mixing of the surface and the point core pinning of the normal centers. The vortex phase diagram has also been drawn for the first time for the FeTe0.60Se0.40, which has very high values of critical current density Jc ~ 1.10(5) Amp/cm2 and the upper critical field Hc2(0) = 65T, with a reasonably high transition temperature Tc =14.5K.