Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh${}_2$Si${}_2$

Abstract

We report far-infrared optical properties of YbRh${}_2$Si${}_2$ for photon energies down to 2 meV and temperatures 0.4 -- 300 K. In the coherent heavy quasiparticle state, a linear dependence of the low-energy scattering rate on both temperature and photon energy was found. We relate this distinct dynamical behavior different from that of Fermi liquid materials to the non-Fermi liquid nature of YbRh${}_2$Si${}_2$ which is due to its close vicinity to an antiferromagnetic quantum critical point.

arXiv comment5 pages, 4 figures. submitted

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