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.

arXiv commentSubmitted to Physical Review B, 6 pages, 6 figures

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Cited by in corpus (6)

• Material Development and Physical Properties of BiS2-Based Layered Compounds
• Pressure-Induced Phase Transition in La${}_{1-x}$Sm${}_x$O${}_{0.5}$F${}_{0.5}$BiS${}_2$
• Ultrasensitive interplay between ferromagnetism and superconductivity in NbGd composite thin films
• 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
• Upper critical magnetic field of $Ln$O${}_{0.5}$F${}_{0.5}$BiS${}_2$ ($Ln$ = La, Nd) superconductors at ambient and high pressure