Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and 
Violation of the Wiedemann-Franz Law in YbRh2Si2

Steglich, Frank

doi:10.1088/0256-307X/41/12/127401

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Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and Violation of the Wiedemann-Franz Law in YbRh₂Si₂

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Steglich, Frank
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Steglich, F. (2024). Fermionic Critical Fluctuations: Potential Driver of Strange Metallicity and Violation of the Wiedemann-Franz Law in YbRh₂Si₂. Chinese physics letters, 41(12): 127401, pp. 1-4. doi:10.1088/0256-307X/41/12/127401.

Cite as: https://hdl.handle.net/21.11116/0000-0010-6FD0-7

Abstract

Results of combined thermal and electrical transport measurements through the magnetic field-induced quantum critical point (QCP) in the heavy-fermion compound YbRh2Si2 were revisited to explore the relationship between the strange-metal behavior observed in electrical and electronic thermal resistivities and the violation of the Wiedemann-Franz (WF) law in the zero-temperature limit. A new type of inelastic scattering center for the charge and heat carriers was detected, attributed to small-to-large Fermi surface fluctuations operating near the Kondo-destroying QCP. These fermionic quantum critical fluctuations are considered the primary driver of the strange-metal behavior and the violation of the WF law.