Crystallographic imperfections and exotic superconductivity of UBe13
Abstract
The symmetry of the superconducting gap is related to the symmetry of the crystal structure. In unconventional superconductors, big changes of the critical temperature, critical field or even the gap structure can happen even for small perturbations of the lattice. In this letter, we use microstructuring to study aluminium-free crystals of UBe13 which are expected to be closer to "perfect" material than previously studied aluminium-grown single crystals. We compare the effect of minuscule imperfections on the value of the critical temperature and critical field, which, in the case of UBe13, has drastic effects, supporting its unconventional nature. We conjecture that this likely arises from the oxidation state of uranium, which is sensitive to its crystal environment. Our findings suggests that uranium-based materials provide not only an excellent reservoir of new unconventional phenomena, but also a way to identify the gap symmetry of unconventional superconductors.
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BibTeX
@misc{leithejasper2026crystallographic,
title = {{Crystallographic imperfections and exotic superconductivity of UBe$_13$}},
author = {Andreas Leithe-Jasper and Markus König and Yusei Shimizu and Konstantin Semeniuk and Primož Koželj and Mitja Krnel and Paul Simon and Wilder Carrillo-Cabrera and Nazar Zaremba and Marcel Naumann and Ulrich Burkhardt and Thomas Doert and Yurii Prots and Alfred Amon and Elena Gati and Matthias Vojta and Yuri Grin and Elena Hassinger and Eteri Svanidze},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.19678},
eprint = {2609.19678},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.19678},
}
RIS
TY - UNPB
TI - Crystallographic imperfections and exotic superconductivity of UBe_13
AU - Andreas Leithe-Jasper
AU - Markus König
AU - Yusei Shimizu
AU - Konstantin Semeniuk
AU - Primož Koželj
AU - Mitja Krnel
AU - Paul Simon
AU - Wilder Carrillo-Cabrera
AU - Nazar Zaremba
AU - Marcel Naumann
AU - Ulrich Burkhardt
AU - Thomas Doert
AU - Yurii Prots
AU - Alfred Amon
AU - Elena Gati
AU - Matthias Vojta
AU - Yuri Grin
AU - Elena Hassinger
AU - Eteri Svanidze
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.19678
UR - https://arxiv.org/abs/2609.19678
AB - The symmetry of the superconducting gap is related to the symmetry of the crystal structure. In unconventional superconductors, big changes of the critical temperature, critical field or even the gap structure can happen even for small perturbations of the lattice. In this letter, we use microstructuring to study aluminium-free crystals of UBe_13 which are expected to be closer to "perfect" material than previously studied aluminium-grown single crystals. We compare the effect of minuscule imperfections on the value of the critical temperature and critical field, which, in the case of UBe_13, has drastic effects, supporting its unconventional nature. We conjecture that this likely arises from the oxidation state of uranium, which is sensitive to its crystal environment. Our findings suggests that uranium-based materials provide not only an excellent reservoir of new unconventional phenomena, but also a way to identify the gap symmetry of unconventional superconductors.
ER -