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arXiv · 2512.03908

Visualization of vortex sheets and half quantum vortices in the chiral odd-parity superconductor UPt$_{3}$

P. García-Campos·V. O. Dolocan·M. -K. Arfaoui·D. Aoki·A. D. Huxley·K. Hasselbach
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Abstract

Superconductivity is characterized by vanishing electrical resistance and magnetic flux expulsion. For conventional type II superconductors, the magnetic flux expulsion is incomplete in an applied magnetic field above a critical value and magnetic flux penetrates the bulk of the superconductor in discrete quantized magnetic flux tubes (vortices), each carrying a single quantum of flux (h/2e). Investigating the unconventional superconductor UPt$_{3}$ with a scanning superconducting quantum interference device (SQUID) microscope, we observed mobile half-quantum vortices together with one quantum vortices. Cooling the material under a higher magnetic field revealed the presence of lines of magnetic contrast resembling domain walls. These observations agree with theoretical predictions for chiral superconductivity with a two dimensional complex order-parameter with sheets of half-quantum vortices separating domains of opposite order-parameter chirality.

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P. García-Campos, V. O. Dolocan, M. -K. Arfaoui, D. Aoki, A. D. Huxley, K. Hasselbach. 2025-12-03. Visualization of vortex sheets and half quantum vortices in the chiral odd-parity superconductor UPt$_{3}$. https://arxiv.org/abs/2512.03908

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