The spin-triplet superconductor UTe2 shows spontaneous time-reversal symmetry breaking and multiple superconducting phases in some crystals, implying chiral superconductivity. Here we microscopically image the local magnetic fields and magnetic susceptibility near the surface of UTe2, observing a homogeneous superfluid density ns and homogeneous pinned vortices. The temperature dependence of ns is consistent with an anisotropic gap and shows no evidence for an additional kink that would be expected at any second phase transition. Our findings are consistent with a dominant B3u superconducting order parameter in the case of a quasi-2D Fermi surface and provide no evidence for multiple phase transitions in ns(T) in UTe2.
@article{arxiv.2210.09562,
title = {Microscopic imaging homogeneous and single phase superfluid density in UTe$_2$},
author = {Yusuke Iguchi and Huiyuan Man and S. M. Thomas and Filip Ronning and Priscila F. S. Rosa and Kathryn A. Moler},
journal= {arXiv preprint arXiv:2210.09562},
year = {2023}
}