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.
@article{arxiv.1905.04343,
title = {Extreme magnetic field-boosted superconductivity},
author = {Sheng Ran and I-Lin Liu and Yun Suk Eo and Daniel J. Campbell and Paul Neves and Wesley T. Fuhrman and Shanta R. Saha and Christopher Eckberg and Hyunsoo Kim and Johnpierre Paglione and David Graf and John Singleton and Nicholas P. Butch},
journal= {arXiv preprint arXiv:1905.04343},
year = {2019}
}