Expansion of the high field-boosted superconductivity in UTe2 under pressure

TL;DR

This study explores how applying pressure affects the high-field-induced superconducting phases in UTe2, revealing phase merging and a distinct pairing mechanism, advancing understanding of magnetic field-induced superconductivity.

Contribution

It provides new insights into pressure effects on high-field superconductivity in UTe2, showing phase merging and a different pairing mechanism from known examples.

Findings

Superconducting phases merge under pressure.

Zero resistance persists up to 45 T.

High-field superconductivity is decoupled from field polarized transition.

Abstract

Magnetic field induced superconductivity is a fascinating quantum phenomenon, whose origin is yet to be fully understood. The recently discovered spin triplet superconductor, UTe2, exhibits two such superconducting phases, with the second one reentering in the magnetic field of 45 T and persisting up to 65 T. More surprisingly, in order to induce this superconducting phase, the magnetic field has to be applied in a special angle range, not along any high symmetry crystalline direction. Here we investigated the evolution of this high-field induced superconducting phase under pressure. Two superconducting phases merges together under pressure, and the zero resistance persists up to 45 T, the field limit of the current study. We also reveal that the high field-induced superconducting phase is completely decoupled from the first order field polarized phase transition, different from previously known example of field induced superconductivity in URhGe, indicating a superconductivity boosted by a different paring mechanism.