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Journal articles
Optical conductivity of URu2Si2 in the Kondo liquid and hidden-order phases
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.
https://hal-cea.archives-ouvertes.fr/cea-01731473
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 14, 2018 - 11:54:26 AM
Last modification on : Tuesday, April 6, 2021 - 2:50:03 PM
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 14, 2018 - 11:54:26 AM
Last modification on : Tuesday, April 6, 2021 - 2:50:03 PM
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