Local observation of linear-$T$ superfluid density and anomalous vortex dynamics in URu${}_2$Si${}_2$

Abstract

The heavy fermion superconductor URu${}_2$Si${}_2$ 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 URu${}_2$Si${}_2$. 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 URu${}_2$Si${}_2$ and suggest that chirality either is not present or does not lead to detectable spontaneous magnetization.

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• Vortex dynamics induced by scanning SQUID susceptometry
• Anomalous superfluid density in a disordered charge density wave material: Pd-intercalated ErTe${}_3$
• Magnetic edge fields in UTe${}_2$ near zero background fields
• Designing edge currents using mesoscopic patterning in chiral d-wave superconductors
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