The heavy fermion superconductor URu2Si2 is a candidate for chiral, time-reversal symmetry-breaking superconductivity with a nodal gap structure. Here, we microscopically visualized superconductivity and spatially inhomogeneous ferromagnetism in URu2Si2. We observed linear-T superfluid density, consistent with d-wave pairing symmetries including chiral d-wave, but did not observe the spontaneous magnetization expected for chiral d-wave. Local vortex pinning potentials had either four- or two-fold rotational symmetries with various orientations at different locations. Taken together, these data support a nodal gap structure in URu2Si2 and suggest that chirality either is not present or does not lead to detectable spontaneous magnetization.
@article{arxiv.2102.07860,
title = {Local observation of linear-$T$ superfluid density and anomalous vortex dynamics in URu$_2$Si$_2$},
author = {Yusuke Iguchi and Irene P. Zhang and Eric D. Bauer and Filip Ronning and John R. Kirtley and Kathryn A. Moler},
journal= {arXiv preprint arXiv:2102.07860},
year = {2021}
}