Effect of pressure on the polarized infrared optical response of quasi-one-dimensional LaTiO${}_{3.41}$

Abstract

The pressure-induced changes in the optical properties of the quasi-one-dimensional conductor LaTiO${}_{3.41}$ were studied by polarization-dependent mid-infrared micro-spectroscopy at room temperature. For the polarization of the incident radiation parallel to the conducting direction, the optical conductivity spectrum shows a pronounced mid-infrared absorption band, exhibiting a shift to lower frequencies and an increase in oscillator strength with increasing pressure. On the basis of its pressure dependence, interpretations of the band in terms of electronic transitions and polaronic excitations are discussed. Discontinuous changes in the optical response near 15 GPa are in agreement with a recently reported pressure-induced structural phase transition and indicate the onset of a dimensional crossover in this highly anisotropic system.

7 pages, 7 figures

References in corpus (6)

• Orbital Physics in the Perovskite Ti Oxides
• Orbital-Spin Structure and Coupling to Lattice in RTiO${}_3$ with R=La,Pr,Nd and Sm
• Determination of the orbital moment and crystal field splitting in LaTiO${}_3$
• Optical study of orbital excitations in transition-metal oxides
• Dielectric properties and dynamical conductivity of LaTiO3: From dc to optical frequencies
• Crystal structure of LaTiO_3.41 under pressure

Cited by in corpus (6)

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• Infrared and Terahertz Spectroscopy of Strongly Correlated Electron Systems under Extreme Conditions
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• Pressure-induced metallization and structural phase transition of the Mott-Hubbard insulator TiOBr
• Polaron physics and crossover transition in magnetite probed by pressure-dependent infrared spectroscopy
• Polarization-dependent infrared reflectivity study of Sr${}_{2.5}$Ca${}_{11.5}$Cu${}_{24}$O${}_{41}$ under pressure: Charge dynamics, charge distribution, and anisotropy