Connecting High-Field and High-Pressure Superconductivity in UTe2

TL;DR

This study maps the superconducting phases of UTe2 under combined pressure and magnetic field, revealing a continuous evolution that unifies high-field and high-pressure superconducting states, indicating a shared order parameter.

Contribution

It demonstrates that high-field and high-pressure superconducting phases in UTe2 are connected and share the same order parameter, unifying previously distinct phases.

Findings

Superconducting phases evolve continuously with pressure and magnetic field.

High-field and high-pressure phases are the same, sharing the same order parameter.

Thermodynamic measurements reveal phase diagram connections.

Abstract

The existence of multiple superconducting phases induced by either pressure or magnetic field is one of the most striking features of superconductivity of UTe$_2$, among the many unusual superconducting properties of this system. Here we report thermodynamic measurements of the superconducting phase diagram combining pressure and magnetic fields up to 30 T. We show that the ambient pressure, high-field, superconducting phase evolves continuously with pressure to join the high-pressure, zero-field superconducting phase. This proves that these two phases are one and the same, and must have the same order parameter.