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Composition Dependence of the Superconducting Properties of UTe2

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Original languageEnglish
JournalJournal of Physics: Condensed Matter
Volume32
Issue number41
Early online date12 Jun 2020
DOIs
Publication statusPublished - 15 Jul 2020

Abstract

A better understanding of the synthesis conditions, composition and physical properties of UTe2 are required to interpret previously reported unconventional superconductivity. Here we report how the superconducting properties of single crystals depend on the ratio of elements present in their synthesis by chemical vapour transport. We have obtained crystals with the highest reported
ambient pressure Tc and a larger superconducting heat capacity jump from a growth with a U:Te ratio different from that widely used in the literature. For these crystals, the ratio of residual heat capacity in the superconducting state to that of the normal state, Υ*/ΥN, is signifcantly lower than 0.5, reported elsewhere. An upturn in the heat capacity below 200 mK is also reduced compared to other studies and is well described by a Schottky anomaly and residual Sommerfeld term rather than quantum critical behaviour.

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