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

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We report the pressure dependence of the optical response of LaTe{sub 2}, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 7 GPa. 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 ... continued below

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19 pages

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Lavagnini, M.; Sacchetti, A.; Degiorgi, L.; Arcangeletti, E.; Baldassarre, L.; Postorino, P. et al. December 14, 2009.

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We report the pressure dependence of the optical response of LaTe{sub 2}, which is deep in the charge-density-wave (CDW) ground state even at 300 K. The reflectivity spectrum is collected in the mid-infrared spectral range at room temperature and at pressures between 0 and 7 GPa. 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 LaTe{sub 2}. 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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19 pages

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  • Journal Name: Submitted to Physical Review B

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  • Report No.: SLAC-PUB-13861
  • Grant Number: AC02-76SF00515
  • DOI: 10.1103/PhysRevB.79.075117 | External Link
  • Office of Scientific & Technical Information Report Number: 969240
  • Archival Resource Key: ark:/67531/metadc934589

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  • December 14, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • July 26, 2017, 11:46 a.m.

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Lavagnini, M.; Sacchetti, A.; Degiorgi, L.; Arcangeletti, E.; Baldassarre, L.; Postorino, P. et al. Pressure dependence of the optical properties of the charge-density-wave compound LaTe2, article, December 14, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc934589/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.