Pressure dependence of the optical properties of the charge-density-wave compound LaTe2

M. Lavagnini, A. Sacchetti, L. Degiorgi, E. Arcangeletti, L. Baldassarre, P. Postorino, S. Lupi, A. Perucchi, K. Y. Shin, and I. R. Fisher
Phys. Rev. B 77, 165132 – Published 29 April 2008

Abstract

We report the pressure dependence of the optical response of LaTe2, which is deep in the charge-density-wave (CDW) ground state even at 300K. The reflectivity spectrum is collected in the midinfrared spectral range at room temperature and at pressures between 0 and 7GPa. We extract the energy scale due to the single-particle excitation across the CDW gap and the Drude weight. We establish that the gap decreases upon compressing the lattice while the Drude weight increases. This signals a reduction in the quality of nesting upon applying pressure, therefore inducing a lesser impact of the CDW condensate on the electronic properties of LaTe2. The consequent suppression of the CDW gap leads to a release of additional charge carriers, manifested by the shift of weight from the gap feature into the metallic component of the optical response. On the contrary, the power-law behavior, seen in the optical conductivity at energies above the gap excitation and indicating a weakly interacting limit within the Tomonaga-Luttinger liquid scenario, seems to be only moderately dependent on pressure.

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  • Received 12 December 2007

DOI:https://doi.org/10.1103/PhysRevB.77.165132

©2008 American Physical Society

Authors & Affiliations

M. Lavagnini, A. Sacchetti, and L. Degiorgi

  • Laboratorium für Festkörperphysik, ETH-Zürich, CH-8093 Zürich, Switzerland

E. Arcangeletti, L. Baldassarre, P. Postorino, and S. Lupi

  • CNR-INFM-Coherentia and Dipartimento di Fisica, Università “La Sapienza,” Piazzale Aldo Moro 5, I-00185 Rome, Italy

A. Perucchi

  • CNR-INFM-Coherentia and Sincrotrone Trieste, Area Science Park, Basovizza, I-34012 Trieste, Italy

K. Y. Shin and I. R. Fisher

  • Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305-4045, USA

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Vol. 77, Iss. 16 — 15 April 2008

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