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

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

2002-05-02

arxiv.org/abs/cond-mat/0205049v2

Phys. Rev. B 67, 035105 (2003)

Physics

Condensed Matter

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.67.035105

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.

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