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

R. P.S.M. Lobo, J. Buhot, M. A. Méasson, D. Aoki, G. Lapertot, P. Lejay, C. C. Homes

Research output: Contribution to journalArticle

7 Citations (Scopus)

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.

Original languageEnglish
Article number045129
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume92
Issue number4
DOIs
Publication statusPublished - 2015 Jul 29
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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