Coexistence of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2

TL;DR

This study reveals that Sr0.5Ce0.5FBiS2 exhibits both superconductivity at 2.8 K and ferromagnetic correlations below 7.5 K, demonstrating coexistence of these two phenomena in a single material.

Contribution

It provides experimental evidence of coexistence of superconductivity and ferromagnetism in Sr0.5Ce0.5FBiS2, a newly studied Ce-doped BiS2-based compound.

Findings

Superconductivity appears at 2.8 K in Sr0.5Ce0.5FBiS2.

Ferromagnetic correlations develop below 7.5 K.

Both phenomena coexist at temperatures below 2.8 K.

Abstract

Through the combination of X-ray diffraction, electrical transport, magnetic susceptibility, and the heat capacity measurements, we studied the effect of Ce doping in the newly discovered SrFBiS${2}$ system. It is found that Sr${0.5}$Ce${0.5}$FBiS${2}$ undergoes a second-order transition below $7.5 K, followed by a superconducting transition with the critical temperature Tc=2.8 K. Our transport, specific heat and DC-magnetization results suggest the presence of bulk ferromagneticcorrelation of Ce ion below 7.5 K that coexist with superconductivity when the temperature is further lowered below 2.8 K.