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arXiv · 2210.09562

Microscopic imaging homogeneous and single phase superfluid density in UTe$_2$

Yusuke Iguchi·Huiyuan Man·S. M. Thomas·Filip Ronning·Priscila F. S. Rosa·Kathryn A. Moler
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Abstract

The spin-triplet superconductor UTe$_2$ 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 UTe$_2$, observing a homogeneous superfluid density $n_s$ and homogeneous pinned vortices. The temperature dependence of $n_s$ 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 $B_{3u}$ superconducting order parameter in the case of a quasi-2D Fermi surface and provide no evidence for multiple phase transitions in $n_s(T)$ in UTe$_2$.

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Yusuke Iguchi, Huiyuan Man, S. M. Thomas, Filip Ronning, Priscila F. S. Rosa, Kathryn A. Moler. 2022-10-18. Microscopic imaging homogeneous and single phase superfluid density in UTe$_2$. https://doi.org/10.1103/physrevlett.130.196003

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