Probing quantum criticality in ferromagnetic CeRh6Ge4
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866911793863983104 |
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| author | Thomas, S. M. Seo, S. Asaba, T. Ronning, F. Rosa, P. F. S. Bauer, E. D. Thompson, J. D. |
| author_facet | Thomas, S. M. Seo, S. Asaba, T. Ronning, F. Rosa, P. F. S. Bauer, E. D. Thompson, J. D. |
| contents | CeRh$_6$Ge$_4$ is unusual in that its ferromagnetic transition can be suppressed continuously to zero temperature, i.e., to a ferromagnetic quantum-critical point (QCP), through the application of modest hydrostatic pressure. This discovery has raised the possibility that the ferromagnetic QCP may be of the Kondo-breakdown type characterized by a jump in Fermi volume, to which thermopower S measurements should be sensitive. Though $S/T$ changes both sign and magnitude around the critical pressure P$_{c}\approx{}0.8$ GPa, these changes are not abrupt but extend over a pressure interval from within the ferromagnetic state up to P$_c$. Together with temperature and pressure variations in electrical resistivity and previously reported heat capacity, thermopower results point to the near coincidence of two sequential effects near P$_c$, delocalization of 4f degrees-of-freedom through orbital-selective hybridization followed by quantum criticality of itinerant ferromagnetism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_07812 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Probing quantum criticality in ferromagnetic CeRh6Ge4 Thomas, S. M. Seo, S. Asaba, T. Ronning, F. Rosa, P. F. S. Bauer, E. D. Thompson, J. D. Strongly Correlated Electrons CeRh$_6$Ge$_4$ is unusual in that its ferromagnetic transition can be suppressed continuously to zero temperature, i.e., to a ferromagnetic quantum-critical point (QCP), through the application of modest hydrostatic pressure. This discovery has raised the possibility that the ferromagnetic QCP may be of the Kondo-breakdown type characterized by a jump in Fermi volume, to which thermopower S measurements should be sensitive. Though $S/T$ changes both sign and magnitude around the critical pressure P$_{c}\approx{}0.8$ GPa, these changes are not abrupt but extend over a pressure interval from within the ferromagnetic state up to P$_c$. Together with temperature and pressure variations in electrical resistivity and previously reported heat capacity, thermopower results point to the near coincidence of two sequential effects near P$_c$, delocalization of 4f degrees-of-freedom through orbital-selective hybridization followed by quantum criticality of itinerant ferromagnetism. |
| title | Probing quantum criticality in ferromagnetic CeRh6Ge4 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2403.07812 |