Abstract
Results of combined thermal and electrical transport measurements through the magnetic field-induced quan-tum 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.
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