Superconductivity induced by La doping in Sr1-xLaxFBiS2 system

TL;DR

This study demonstrates that La doping induces bulk superconductivity in SrFBiS2, with a transition temperature of 2.8 K, confirmed by multiple measurements, highlighting electron doping as an effective method to achieve superconductivity in this system.

Contribution

First demonstration of bulk superconductivity in SrFBiS2 via La doping, establishing electron doping as a viable route for inducing superconductivity in this material.

Findings

Superconductivity with Tc of 2.8 K observed in Sr0.5La0.5FBiS2

Bulk superconductivity confirmed by diamagnetic and heat capacity measurements

Estimated upper critical field Hc2(0) of 1 Tesla

Abstract

Through a combination of X-ray diffraction, electrical transport, magnetic susceptibility, and heat capacity measurements, we report the effect of La doping on Sr in the newly discovered SrFBiS2 system. Superconducting transition with critical temperature Tc of 2.8 K, developed from a semiconducting-like normal state, was found in Sr0.5La0.5FBiS2. A strong diamagnetic signal and a clear specific heat anomaly associated with this transition were observed, confirming bulk superconductivity. The upper critical field Hc2(0) was estimated to be 1 Tesla by using the Ginzburg-Landau approach. Our experiments therefore demonstrate that bulk superconductivity can be achieved by electron doping in the SrFBiS2 system.