Acoustic signatures of the field-induced electronic-topological transitions in YbNi$_4$P$_2$
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917190842712064 |
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| author | Eljaouhari, E. -O. Schwarze, B. V. Kliemt, K. Krellner, C. Husstedt, F. Wosnitza, J. Zherlitsyn, S. Zwicknagl, G. Sourd, J. |
| author_facet | Eljaouhari, E. -O. Schwarze, B. V. Kliemt, K. Krellner, C. Husstedt, F. Wosnitza, J. Zherlitsyn, S. Zwicknagl, G. Sourd, J. |
| contents | We investigated the magnetoelastic properties of an YbNi$_4$P$_2$ single crystal at low temperatures under magnetic fields directed along the crystallographic [001] axis. We report a series of strong anomalies in the sound velocity, which is consistent with the cascade of electronic-topological transitions reported previously for this compound. In particular, we identify the vanishing of a small orbit on the Fermi surface, associated with a quantum-oscillation frequency of 34 T. Furthermore, the different transitions are better resolved with acoustic modes of particular symmetry. Using a microscopic model adapted to the strongly correlated electronic structure of YbNi$_4$P$_2$, we describe our results by inspecting realistic electron-phonon couplings in reciprocal space for each acoustic mode. This shows how the $k$ selectivity of ultrasound experiments allows to investigate Fermi-surface reconstructions in strongly correlated electronic systems. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2601_05126 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Acoustic signatures of the field-induced electronic-topological transitions in YbNi$_4$P$_2$ Eljaouhari, E. -O. Schwarze, B. V. Kliemt, K. Krellner, C. Husstedt, F. Wosnitza, J. Zherlitsyn, S. Zwicknagl, G. Sourd, J. Strongly Correlated Electrons We investigated the magnetoelastic properties of an YbNi$_4$P$_2$ single crystal at low temperatures under magnetic fields directed along the crystallographic [001] axis. We report a series of strong anomalies in the sound velocity, which is consistent with the cascade of electronic-topological transitions reported previously for this compound. In particular, we identify the vanishing of a small orbit on the Fermi surface, associated with a quantum-oscillation frequency of 34 T. Furthermore, the different transitions are better resolved with acoustic modes of particular symmetry. Using a microscopic model adapted to the strongly correlated electronic structure of YbNi$_4$P$_2$, we describe our results by inspecting realistic electron-phonon couplings in reciprocal space for each acoustic mode. This shows how the $k$ selectivity of ultrasound experiments allows to investigate Fermi-surface reconstructions in strongly correlated electronic systems. |
| title | Acoustic signatures of the field-induced electronic-topological transitions in YbNi$_4$P$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2601.05126 |