Studies of superconductivity in U(Pt1-xPdx)3 for x < 0.006

TL;DR

This study investigates how minimal Pd doping affects superconductivity in U(Pt1-xPdx)3, revealing a critical concentration where superconductivity ceases and antiferromagnetism emerges, with detailed phase diagram insights.

Contribution

It provides the first detailed phase diagram of U(Pt1-xPdx)3 showing the suppression of superconductivity and onset of antiferromagnetism at low Pd concentrations.

Findings

Superconductivity is destroyed at x = 0.006.

Large-moment antiferromagnetism appears above x = 0.006.

Double superconducting transition splitting increases with Pd content.

Abstract

We report measurements of the specific heat and resistivity (T < 1 K) for high quality polycrystals of U(Pt1-xPdx)3 with x < 0.006. The Tc-x phase diagram can be constructed, and superconductivity is destroyed for x = 0.006; this is approximately the same concentration above which the onset of large-moment antiferromagnetism is observed to occur. The splitting of the double superconducting transition increases smoothly with increasing Pd content, and is large enough that for Pd concentrations 0.004 < x < 0.006 only the superconducting A-phase will be present.