Enhancement of Superconductivity in La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$

Abstract

The superconducting and normal-state properties of La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$ (0.1 $⩽$ $x$ $⩽$ 0.9) have been studied via electrical resistivity, magnetic susceptibility, and specific heat measurements. By using suitable synthesis conditions, Sm exhibits considerable solubility into the CeOBiS${}_2$-type LaO${}_{0.5}$F${}_{0.5}$BiS${}_2$ lattice. In addition to a considerable enhancement of the superconducting volume fraction, it is found that the superconducting transition temperature $T_c$ is dramatically enhanced with increasing Sm concentration to 5.4 K at $x$ = 0.8. These results suggest that $T_c$ for SmO${}_{0.5}$F${}_{0.5}$BiS${}_2$ could be as high as $\sim$6.2 K and comparably high $T_c$ values might also be obtained in $Ln$O${}_{0.5}$F${}_{0.5}$BiS${}_2$ ($Ln$ = Eu - Tm) if these compounds can be synthesized.

Submitted to Physical Review B, 6 pages, 6 figures

References in corpus (7)

• Superconductivity Appears in the Vicinity of an Insulating-Like Behavior in CeO${}_{1-x}$F${}_x$BiS${}_2$
• Superconductivity of F-substituted LnOBiS2 (Ln = La, Ce, Pr, Nd, Yb) compounds
• Superconductivity induced by La doping in Sr1-xLaxFBiS2 system
• Pressure Study of BiS2-Based Superconductors Bi4O4S3 and La(O,F)BiS2
• Evolution of superconductivity in LaO1-xFxBiS2 prepared by high pressure technique
• Stabilization of high-Tc phase of BiS2-based superconductor LaO0.5F0.5BiS2 using high-pressure synthesis
• Optical spectroscopy study of Nd(O,F)BiS2 single crystals

Cited by in corpus (2)

• High pressure effects on non-fluorinated BiS2-based superconductors La${}_{1-x}$M${}_x$OBiS${}_2$ (M = Ti and Th)
• Effect of Lead Substitution on LaO0.5F0.5BiS2