Appearance of superconductivity in new BiS2 based layered LaO0.5F0.5BiS2

TL;DR

This study reports the synthesis and characterization of a new BiS2-based layered superconductor, LaO0.5F0.5BiS2, demonstrating bulk superconductivity with a transition temperature of 2.7K through various experimental techniques.

Contribution

First synthesis and detailed physical property analysis of LaO0.5F0.5BiS2 superconductor showing bulk superconductivity.

Findings

Superconducting transition temperature (Tc) of 2.7K confirmed.

Flux pinning and irreversible behavior observed in magnetization.

Resistivity measurements support bulk superconductivity.

Abstract

We report here synthesis, structural, DC magnetization, and transport studies of new BiS2 based layered LaO0.5F0.5BiS2 superconductor [1]. The sample was synthesized by conventional solid state route via vacuum encapsulation technique at 800oC for 12h. LaO0.5F0.5BiS2 crystallizes in tetragonal P4/nmm space group with lattice parameters a = 4.0703(5){\AA}, c = 13.3902(4){\AA}. Bulk superconductivity is confirmed with superconducting transition temperature (Tc) of 2.7K by DC magnetization measurements. The Isothermal magnetization (MH) measurements showed closed loops with clear signatures of flux pinning and irreversible behavior. The resistivity measurements confirmed an onset Tc of 2.7K. The magneto-transport {\rho}(T,H) measurements showed a resistive broadening and decrease in Tc ({\rho}=0) to lower temperatures with increasing magnetic field. The magnetic phase diagram involving upper critical and irreversibility fields as a function of temperature has been ascertained. Our DC magnetization and electrical transport measurements confirm the appearance of bulk superconductivity in LaO0.5F0.5BiS2 superconductor.