Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh$_{2}$Si$_{2}$

S. Kimura; J. Sichelschmidt; J. Ferstl; C. Krellner; C. Geibel; F. Steglich

doi:10.1103/PhysRevB.74.132408

paper

Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh $_{2}$ Si $_{2}$

arXiv:cond-mat/0608636 · doi:10.1103/PhysRevB.74.132408

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.

5 pages, 4 figures. submitted

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Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh2​Si2​

Abstract

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Observation of an optical non-Fermi-liquid behavior in the heavy fermion state of YbRh $_{2}$ Si $_{2}$