Type-I superconductivity in a quasi-2D topologically nontrivial YbBi2
Abstract
Intrinsic superconductivity in stoichiometric materials with nontrivial electronic topology remains uncommon, limiting opportunities to investigate how these two phenomena coexist within a single electronic system. Here, we report bulk type-I superconductivity below Tc ∼ 0.9~K in YbBi2, a layered rare-earth compound with a nonsymmorphic crystal structure and a quasi-two-dimensional Fermi surface. Thermodynamic and transport measurements establish the superconducting ground state, while quantum oscillations reveal exceptionally light carriers, with a cyclotron mass as low as 0.07 me, and a nonzero Berry phase of approximately 0.82 π. The latter closely matches the calculated value of the corresponding Wilson phase 0.99 π for the corresponding orbit near a symmetry-protected band degeneracy. ARPES measurements show good agreement with key features of the calculated electronic structure, providing complementary experimental constraints on the normal-state band structure. The combination of intrinsic type-I superconductivity, light quasi-two-dimensional carriers, and signatures of nontrivial electronic topology identifies YbBi2 as a distinct stoichiometric platform for investigating superconductivity in a topologically nontrivial electronic environment.
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BibTeX
@misc{gornicka2026typei,
title = {{Type-I superconductivity in a quasi-2D topologically nontrivial YbBi$_2$}},
author = {Karolina Górnicka and Sudip Malick and Joanna Bławat and Michał Modrzejewski and Hanna Świątek and Michał J. Winiarski and Federico Mazzola and Ivana Vobornik and Chiara Bigi and Jacob Cook and Brenden R. Ortiz and Andrew F. May and Andrzej P. Kądzielawa and John Singleton and Bartlomiej Wiendlocha and Tomasz Klimczuk},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.20093},
eprint = {2609.20093},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.20093},
}
RIS
TY - UNPB
TI - Type-I superconductivity in a quasi-2D topologically nontrivial YbBi_2
AU - Karolina Górnicka
AU - Sudip Malick
AU - Joanna Bławat
AU - Michał Modrzejewski
AU - Hanna Świątek
AU - Michał J. Winiarski
AU - Federico Mazzola
AU - Ivana Vobornik
AU - Chiara Bigi
AU - Jacob Cook
AU - Brenden R. Ortiz
AU - Andrew F. May
AU - Andrzej P. Kądzielawa
AU - John Singleton
AU - Bartlomiej Wiendlocha
AU - Tomasz Klimczuk
PY - 2026
DA - 2026/09/17
PB - arXiv
DO - 10.48550/arxiv.2609.20093
UR - https://arxiv.org/abs/2609.20093
AB - Intrinsic superconductivity in stoichiometric materials with nontrivial electronic topology remains uncommon, limiting opportunities to investigate how these two phenomena coexist within a single electronic system. Here, we report bulk type-I superconductivity below T_c ∼ 0.9~K in YbBi_2, a layered rare-earth compound with a nonsymmorphic crystal structure and a quasi-two-dimensional Fermi surface. Thermodynamic and transport measurements establish the superconducting ground state, while quantum oscillations reveal exceptionally light carriers, with a cyclotron mass as low as 0.07 m_e, and a nonzero Berry phase of approximately 0.82 π. The latter closely matches the calculated value of the corresponding Wilson phase 0.99 π for the corresponding orbit near a symmetry-protected band degeneracy. ARPES measurements show good agreement with key features of the calculated electronic structure, providing complementary experimental constraints on the normal-state band structure. The combination of intrinsic type-I superconductivity, light quasi-two-dimensional carriers, and signatures of nontrivial electronic topology identifies YbBi_2 as a distinct stoichiometric platform for investigating superconductivity in a topologically nontrivial electronic environment.
ER -