Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe$_2$
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913935476654080 |
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| author | Husstedt, Freya Kimata, Motoi Thadathil, Sajal Naduvile Schwarze, Beat Valentin König, Markus Lapertot, Gerard Brison, Jean-Pascal Knebel, Georg Aoki, Dai Wosnitza, J. Helm, Toni |
| author_facet | Husstedt, Freya Kimata, Motoi Thadathil, Sajal Naduvile Schwarze, Beat Valentin König, Markus Lapertot, Gerard Brison, Jean-Pascal Knebel, Georg Aoki, Dai Wosnitza, J. Helm, Toni |
| contents | Details of the electronic band structure in unconventional superconductors are key to the understanding of their fundamental ground state. The potential spin-triplet superconductor UTe$_2$, with $T_\mathrm{c}\approx 2.1\,$K, has attracted attention recently. Its main Fermi surface consists of weakly corrugated, two-dimensional Fermi-surface cylinders that run along the crystallographic $c$ axis. In addition, there is evidence for the presence of an additional small three-dimensional band. This has been discussed controversially as it may be essential for the realization of superconductivity in UTe$_2$. Here, we investigate the angle-resolved magnetoresistance and Hall effect in bulk crystalline samples with current along the $c$ axis in fields up to $60\,$T. We observe low-frequency magnetic quantum oscillations with light effective masses that are most pronounced for magnetic field applied along the $a$ axis. Two distinct frequencies indicate two separate changes in the Fermi-surface topology, likely connected with Lifshitz transitions. We discuss the origin of these oscillations in terms of magnetic breakdown, quantum interference, and other potential mechanisms. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11525 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe$_2$ Husstedt, Freya Kimata, Motoi Thadathil, Sajal Naduvile Schwarze, Beat Valentin König, Markus Lapertot, Gerard Brison, Jean-Pascal Knebel, Georg Aoki, Dai Wosnitza, J. Helm, Toni Strongly Correlated Electrons Details of the electronic band structure in unconventional superconductors are key to the understanding of their fundamental ground state. The potential spin-triplet superconductor UTe$_2$, with $T_\mathrm{c}\approx 2.1\,$K, has attracted attention recently. Its main Fermi surface consists of weakly corrugated, two-dimensional Fermi-surface cylinders that run along the crystallographic $c$ axis. In addition, there is evidence for the presence of an additional small three-dimensional band. This has been discussed controversially as it may be essential for the realization of superconductivity in UTe$_2$. Here, we investigate the angle-resolved magnetoresistance and Hall effect in bulk crystalline samples with current along the $c$ axis in fields up to $60\,$T. We observe low-frequency magnetic quantum oscillations with light effective masses that are most pronounced for magnetic field applied along the $a$ axis. Two distinct frequencies indicate two separate changes in the Fermi-surface topology, likely connected with Lifshitz transitions. We discuss the origin of these oscillations in terms of magnetic breakdown, quantum interference, and other potential mechanisms. |
| title | Slow magnetic quantum oscillations in the c-axis magnetoresistance of UTe$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2503.11525 |