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Phys Rev Lett. 2013 Jun 7;110(23):236402. Epub 2013 Jun 7.

Verification of the Wiedemann-Franz law in YbRh2Si2 at a quantum critical point.

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Department of Physics, Tokyo Institute of Technology, Meguro 152-8551, Japan.
SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, Grenoble, F-38054, France.


The thermal conductivity measurements are performed on the heavy-fermion compound YbRh(2)Si(2) down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B(c)=0.66  T∥c axis. In the limit as T→0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP despite the destruction of the standard signature of Fermi liquid. Our results place strong constraints on models that attempt to describe the nature of the unconventional quantum criticality of YbRh(2)Si(2).

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