Superconductivity in nickel-based compound GdONiBi and hole doped Gd0.9Sr0.1ONiBi

TL;DR

This paper reports the synthesis of a nickel-based superconductor GdONiBi with a transition temperature of 4.5 K, and a hole-doped variant Gd0.9Sr0.1ONiBi with a slightly higher Tc of 4.7 K, highlighting differences in their normal state properties.

Contribution

The study introduces a new nickel-based superconductor and its hole-doped version, providing insights into their superconducting properties and normal state behaviors.

Findings

GdONiBi has Tc ~4.5 K with metallic resistivity.

Hole doping with Sr increases Tc to ~4.7 K.

Magnetoresistance behavior differs from iron-based superconductors.

Abstract

We successfully synthesized the nickel-based compound GdONiBi with superconducting transition temperature about 4.5 K. By partially substituting the element Gd with Sr to introduce holes into the material, we got new superconductor Gd0.9Sr0.1ONiBi with critical temperature about 4.7 K. The normal state resistivity in nickel-based samples shows a metallic behavior. The magnetoresistance measurements show a different behavior compared to those in iron-based compounds which indicates that the mechanism in the two kinds of superconductors maybe different.