Superconductivity in REO0.5F0.5BiS2 with high-entropy-alloy-type blocking layers

TL;DR

This study reports the synthesis of REO0.5F0.5BiS2 superconductors with high-entropy-alloy-type blocking layers, showing improved superconducting transition temperatures and properties, indicating the potential of HEA states in enhancing superconductor performance.

Contribution

First demonstration of high-entropy-alloy-type REO blocking layers in REO0.5F0.5BiS2 superconductors with enhanced properties.

Findings

Higher transition temperatures in HEA-type samples.

Sharp superconducting transitions observed.

Lattice constants systematically varied with RE composition.

Abstract

We synthesized new REO0.5F0.5BiS2 (RE: rare earth) superconductors with the high-entropy-alloy-type (HEA-type) REO blocking layers. According to the RE concentration and the RE ionic radius, the lattice constant of a systematically changed in the HEA-type samples. A sharp superconducting transition was observed in the resistivity measurements for all the HEA-type samples, and the transition temperature of the HEA-type samples was higher than that of typical REO0.5F0.5BiS2. The sharp superconducting transition and the enhanced superconducting properties of the HEA-type samples may indicate the effectiveness of the HEA states of the REO blocking layers in the REO0.5F0.5BiS2 system.