Hybridization gap and anisotropic far-infrared optical conductivity of URu2Si2

J. Levallois, F. Lévy-Bertrand, M. K. Tran, D. Stricker, J. A. Mydosh, Y.-K. Huang, and D. van der Marel
Phys. Rev. B 84, 184420 – Published 15 November 2011

Abstract

We performed far-infrared optical spectroscopy measurements on the heavy fermion compound URu2Si2 as a function of temperature. The light's electric field was applied along the a or c axis of the tetragonal structure. We show that in addition to a pronounced anisotropy, the optical conductivity exhibits for both axis a partial suppression of spectral weight around 12 meV and below 30 K. We attribute these observations to a change in the band structure below 30 K. However, since these changes have no noticeable impact on the entropy nor on the DC transport properties, we suggest that this is a crossover phenomenon rather than a thermodynamic phase transition.

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  • Received 4 July 2010

DOI:https://doi.org/10.1103/PhysRevB.84.184420

©2011 American Physical Society

Authors & Affiliations

J. Levallois1, F. Lévy-Bertrand1,2, M. K. Tran1, D. Stricker1, J. A. Mydosh3, Y.-K. Huang4, and D. van der Marel1

  • 1Département de Physique de la Matière Condensée, Université de Genève, CH-1211 Genève 4, Switzerland
  • 2Institut Néel, CNRS et Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
  • 3Kamerlingh Onnes Laboratory, Leiden University, 2300RA Leiden, The Netherlands
  • 4Van der Waals-Zeeman Institute, University of Amsterdam, 1018XE Amsterdam, The Netherlands

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Issue

Vol. 84, Iss. 18 — 1 November 2011

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