Signatures of polaronic excitations in quasi-one-dimensional LaTiO${}_{3.41}$

Abstract

The optical properties of quasi-one-dimensional metallic LaTiO${}_{3.41}$ are studied for the polarization along the $a$ and $b$ axes. With decreasing temperature modes appear along both directions suggestive for a phase transition. The broadness of these modes along the conducting axis might be due to the coupling of the phonons to low-energy electronic excitations across an energy gap. We observe a pronounced midinfrared band with a temperature dependence consistent with (interacting) polaron models. The polaronic picture is corroborated by the presence of strong electron-phonon coupling and the temperature dependence of the dc conductivity.

5 pages, 5 figures

References in corpus (1)

• Extremely Small Energy Gap in the Quasi-One-Dimensional Conducting Chain Compound SrNbO${}_{3.41}$

Cited by in corpus (8)

• Electrodynamics of Correlated Electron Materials
• Crystal structure of LaTiO_3.41 under pressure
• Electronic and vibrational properties of low-dimensional perovskites Sr${}_{1-y}$La${}_y$NbO${}_{3.5-x}$
• Effect of pressure on the polarized infrared optical response of quasi-one-dimensional LaTiO${}_{3.41}$
• Correlation of optical conductivity and ARPES spectra of strong-coupling large polarons and its display in cuprates
• Magnetic interactions of cold atoms with anisotropic conductors
• Polaron physics and crossover transition in magnetite probed by pressure-dependent infrared spectroscopy
• Optical conductivity of the metallic pyrochlore iridate Pr${}_2$Ir${}_2$O${}_7$: Influence of spin-orbit coupling and electronic correlations on the electronic structure