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We report far-infrared optical properties of YbRh$_{2}$Si$_{2}$ for photonenergies down to 2 meV and temperatures 0.4 -- 300 K. In the coherent heavyquasiparticle state, a linear dependence of the low-energy scattering rate onboth temperature and photon energy was found. We relate this distinct dynamicalbehavior different from that of Fermi liquid materials to the non-Fermi liquidnature of YbRh$_{2}$Si$_{2}$ which is due to its close vicinity to anantiferromagnetic quantum critical point.Comment: 5 pages, 4 figures. submitte

physical review. b, condensed matter and materials physics

Optical observation of non-Fermi-liquid behavior in the heavy fermion state of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Yb</mml:mi><mml:msub><mml:mi mathvariant="normal">Rh</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Optical observation of non-Fermi-liquid behavior in the heavy fermion state ofYbRh2Si2