Disorder Effects in the Bipolaron System Ti$_{4}$O$_{7}$ Studied by Photoemission Spectroscopy

Details Disorder Effects in the Bipolaron System Ti$_{4}$O$_{7}$ Studied by Photoemission Spectroscopy Disorder Effects in the Bipolaron System Ti$_{4}$O$_{7}$ Studied by Photoemission Spectroscopy

1999-09-13

arxiv.org/abs/cond-mat/9909189v1

Europhys. Lett. 59, 868 (2002).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 epsf figures embedded

Scientific paper

10.1209/epl/i2002-00123-2

We have performed a photoemission study of Ti$_{4}$O$_{7}$ around its two transition temperatures so as to cover the metallic, high-temperature insulating (bipolaron-liquid), and low-temperature insulating (bipolaron-crystal) phases. While the spectra of the low-temperature insulating phase show a finite gap at the Fermi level, the spectra of the high-temperature insulating phase are gapless, which is interpreted as a soft Coulomb gap due to dynamical disorder. We suggest that the spectra of the high-temperature disordered phase of Fe$_{3}$O$_{4}$, which exhibits a charge order-disorder transition (Verwey transition), can be interpreted in terms of a Coulomb gap.

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