The thermopower as a fingerprint of the Kondo breakdown quantum critical point

Abstract

We propose that the thermoelectric power distinguishes two competing scenarios for quantum phase transitions in heavy fermions : the spin-density-wave (SDW) theory and breakdown of the Kondo effect. In the Kondo breakdown scenario, the Seebeck coefficient turns out to collapse from the temperature scale $E^{\ast }$, associated with quantum fluctuations of the Fermi surface reconfiguration. This feature differs radically from the physics of the SDW theory, where no reconstruction of the Fermi surface occurs, and can be considered as the hallmark of the Kondo breakdown theory. We test these ideas, upon experimental results for YbRh${}_2$Si${}_2$.

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Cited by in corpus (5)

• Magnetic Polarization and Fermi Surface Instability: Case of YbRh2Si2
• Organic Superconductors: when correlations and magnetism walk in
• Strongly correlated Fermi systems as a new state of matter
• Nambu-Eliashberg theory for multi-scale quantum criticality : Application to ferromagnetic quantum criticality in the surface of three dimensional topological insulators
• Thermodynamic signatures of a fractionalized Fermi liquid