The Fermi surface of RuO2 measured by quantum oscillations
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913997158088704 |
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| author | Wu, Zheyu Long, Mengmeng Chen, Hanyi Paul, Shubhankar Matsuki, Hisakazu Zheliuk, Oleksandr Zeitler, Uli Li, Gang Zhou, Rui Zhu, Zengwei Graf, Dave Weinberger, Theodore I. Grosche, F. Malte Maeno, Yoshiteru Eaton, Alexander G. |
| author_facet | Wu, Zheyu Long, Mengmeng Chen, Hanyi Paul, Shubhankar Matsuki, Hisakazu Zheliuk, Oleksandr Zeitler, Uli Li, Gang Zhou, Rui Zhu, Zengwei Graf, Dave Weinberger, Theodore I. Grosche, F. Malte Maeno, Yoshiteru Eaton, Alexander G. |
| contents | The metallic oxide RuO$_2$ has emerged as a promising altermagnet candidate, owing to reports of this material hosting antiferromagnetic ordering accompanied by a spin-split electronic band structure characteristic of time-reversal symmetry-breaking. However, recent studies have robustly questioned this scenario. Here we map the Fermi surface of pristine single-crystalline RuO$_2$. By measuring magnetic quantum oscillations of a bulk thermodynamic property, our study resolves the electronic structure present in the bulk of RuO$_2$. Several Fermi sheets are discerned, with a range of effective quasiparticle masses up to five times that of the bare electron mass. We compare our measurements with the predictions for altermagnetic and nonmagnetic Fermi surfaces deduced from density functional theory calculations. The quantum oscillatory frequency spectra correspond very poorly to the profile expected for the case of altermagnetism; by contrast, they correspond well to the nonmagnetic scenario. Our findings place significant constraints on the bulk magnetic properties of RuO$_2$, and strongly suggest that this material is a paramagnet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_20621 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Fermi surface of RuO2 measured by quantum oscillations Wu, Zheyu Long, Mengmeng Chen, Hanyi Paul, Shubhankar Matsuki, Hisakazu Zheliuk, Oleksandr Zeitler, Uli Li, Gang Zhou, Rui Zhu, Zengwei Graf, Dave Weinberger, Theodore I. Grosche, F. Malte Maeno, Yoshiteru Eaton, Alexander G. Materials Science Mesoscale and Nanoscale Physics The metallic oxide RuO$_2$ has emerged as a promising altermagnet candidate, owing to reports of this material hosting antiferromagnetic ordering accompanied by a spin-split electronic band structure characteristic of time-reversal symmetry-breaking. However, recent studies have robustly questioned this scenario. Here we map the Fermi surface of pristine single-crystalline RuO$_2$. By measuring magnetic quantum oscillations of a bulk thermodynamic property, our study resolves the electronic structure present in the bulk of RuO$_2$. Several Fermi sheets are discerned, with a range of effective quasiparticle masses up to five times that of the bare electron mass. We compare our measurements with the predictions for altermagnetic and nonmagnetic Fermi surfaces deduced from density functional theory calculations. The quantum oscillatory frequency spectra correspond very poorly to the profile expected for the case of altermagnetism; by contrast, they correspond well to the nonmagnetic scenario. Our findings place significant constraints on the bulk magnetic properties of RuO$_2$, and strongly suggest that this material is a paramagnet. |
| title | The Fermi surface of RuO2 measured by quantum oscillations |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2503.20621 |