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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2015

Optical conductivity of URu2Si2 in the Kondo liquid and hidden-order phases

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Abstract

We measured the polarized optical conductivity of URu2Si2 from room temperature down to 5 K, covering the Kondo state, the coherent Kondo liquid regime, and the hidden-order phase. The normal state is characterized by an anisotropic behavior between the ab plane and c-axis responses. The ab-plane optical conductivity is strongly influenced by the formation of the coherent Kondo liquid: a sharp Drude peak develops and a hybridization gap at 12 meV leads to a spectral weight transfer to mid-infrared energies. The c-axis conductivity has a different behavior: the Drude peak already exists at 300 K and no particular anomaly or gap signature appears in the coherent Kondo liquid regime. When entering the hidden-order state, both polarizations see a dramatic decrease in the Drude spectral weight and scattering rate, compatible with a loss of about 50% of the carriers at the Fermi level. At the same time a density-wave-like gap appears along both polarizations at about 6.5 meV at 5 K. This gap closes respecting a mean-field thermal evolution in the ab plane. Along the c-axis it remains roughly constant and it "fills up" rather than closing.

Dates and versions

cea-01731473 , version 1 (14-03-2018)

Identifiers

Cite

R. P. S. M. Lobo, Jonathan Buhot, M. A. Measson, Dai Aoki, Gerard Lapertot, et al.. Optical conductivity of URu2Si2 in the Kondo liquid and hidden-order phases. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 92 (4), pp.045129. ⟨10.1103/PhysRevB.92.045129⟩. ⟨cea-01731473⟩
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