Superconductivity phase diagram of Se-substituted CeO0.5F0.5Bi(S1-xSex)2

TL;DR

This study explores how selenium substitution affects the lattice structure and superconductivity in CeO0.5F0.5Bi(S1-xSex)2, revealing optimal doping levels and comparing phase diagrams with related compounds.

Contribution

It provides the first detailed superconductivity phase diagram for Se-substituted CeO0.5F0.5Bi(S1-xSex)2 and compares it with similar materials, highlighting the effects of Se doping.

Findings

Superconductivity observed at x=0.2-0.4, peaking at x=0.3.

Lattice constant a increases with Se content, c remains stable.

Phase diagram differs from La and Nd analogs.

Abstract

We investigated the effects of Se substitution on the lattice constants and superconducting properties of CeO0.5F0.5Bi(S1-xSex)2. With increasing Se concentration, the a lattice constant increased, while the c lattice constant did not show any significant increase between x = 0.1 and x = 0.5. Bulk superconductivity was observed in samples with x = 0.2-0.4, and the superconducting transition temperature was the highest at x = 0.3. The obtained superconductivity phase diagram was compared to those of LaO0.5F0.5Bi(S1-xSex)2 and NdO0.5F0.5Bi(S1-xSex)2.