# Extreme magnetic field-boosted superconductivity

## TL;DR

This paper reports the discovery of multiple high-field reentrant superconducting phases in UTe2, including the highest magnetic field superconductivity observed, driven by magnetic fluctuations and quantum dimensional crossover.

## Contribution

It uncovers unprecedented high-field reentrant superconductivity in UTe2, revealing a new type of exotic superconductivity influenced by magnetic fluctuations.

## Key findings

- Superconductivity persists beyond 65 T in UTe2.
- Multiple high-field reentrant superconducting phases observed.
- Superconductivity linked to magnetic fluctuations and quantum crossover.

## Abstract

Applied magnetic fields underlie exotic quantum states, such as the fractional quantum Hall effect and Bose-Einstein condensation of spin excitations. Superconductivity, on the other hand, is inherently antagonistic towards magnetic fields. Only in rare cases can these effects be mitigated over limited fields, leading to reentrant superconductivity. Here, we report the unprecedented coexistence of multiple high-field reentrant superconducting phases in the spin-triplet superconductor UTe2. Strikingly, we observe superconductivity in the highest magnetic field range identified for any reentrant superconductor, beyond 65 T. These extreme properties reflect a new kind of exotic superconductivity rooted in magnetic fluctuations and boosted by a quantum dimensional crossover.