Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-07-14
Phys. Rev. B 68, 245108 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 8 figures, 1 table
Scientific paper
10.1103/PhysRevB.68.245108
We provide a complete and detailed characterization of the temperature-dependent response to ac electrical fields of LaTiO3, a Mott-Hubbard insulator close to the metal-insulator transition. We present combined dc, broadband dielectric, mm-wave, and infrared spectra of ac conductivity and dielectric constant, covering an overall frequency range of 17 decades. The dc and dielectric measurements reveal information on the semiconducting charge-transport properties of LaTiO3, indicating the importance of Anderson localization, and on the dielectric response due to ionic polarization. In the infrared region, the temperature dependence of the phonon modes gives strong hints for a structural phase transition at the magnetic ordering temperature. In addition, a gap-like electronic excitation following the phonon region is analyzed in detail. We compare the results to the soft-edge behavior of the optical spectra characteristic for Mott-Hubbard insulators. Overall a consistent picture of the charge-transport mechanisms in LaTiO3 emerges.
Hemberger Joachim
Lichtenberg F.
Loidl Alois
Lunkenheimer P.
Pimenov Andrei
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