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

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

2010-05-19

arxiv.org/abs/1005.3354v2

Phys. Rev. B 83, 073104 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.83.073104

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 $E^{*}$, 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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