Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and Violation of the Wiedemann-Franz Law in YbRh2Si2
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arXiv
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| Format: | Preprint |
| Veröffentlicht: |
2025
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| _version_ | 1866911300011950080 |
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| author | Steglich, Frank |
| author_facet | Steglich, Frank |
| contents | Results of combined thermal and electrical transport measurements through the magnetic field-induced quantum critical point in the heavy-fermion compound YbRh2Si2 are revisited to explore the relationship between the strange-metal behavior, observed in both the electrical and electronic thermal resistivity, and the violation of the Wiedemann-Franz law in the zero-temperature limit. A new type of inelastic scattering center for the charge and heat carriers has been detected and ascribed to the small-to-large Fermi-surface fluctuations. These are operating in the vicinity of and at the Kondo-destroying quantum critical point as fermionic quantum critical fluctuations and are considered the primary driver of the strange-metal behavior and the violation of the Wiedemann-Franz law. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_03618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and Violation of the Wiedemann-Franz Law in YbRh2Si2 Steglich, Frank Strongly Correlated Electrons Results of combined thermal and electrical transport measurements through the magnetic field-induced quantum critical point in the heavy-fermion compound YbRh2Si2 are revisited to explore the relationship between the strange-metal behavior, observed in both the electrical and electronic thermal resistivity, and the violation of the Wiedemann-Franz law in the zero-temperature limit. A new type of inelastic scattering center for the charge and heat carriers has been detected and ascribed to the small-to-large Fermi-surface fluctuations. These are operating in the vicinity of and at the Kondo-destroying quantum critical point as fermionic quantum critical fluctuations and are considered the primary driver of the strange-metal behavior and the violation of the Wiedemann-Franz law. |
| title | Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and Violation of the Wiedemann-Franz Law in YbRh2Si2 |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.03618 |