Electronic structure and polarons in CaMnO3δ single crystals: Optical data

N. N. Loshkareva, L. V. Nomerovannaya, E. V. Mostovshchikova, A. A. Makhnev, Yu. P. Sukhorukov, N. I. Solin, T. I. Arbuzova, S. V. Naumov, N. V. Kostromitina, A. M. Balbashov, and L. N. Rybina
Phys. Rev. B 70, 224406 – Published 7 December 2004

Abstract

The ellipsometry measurements (in the energy range E=0.55.0eV) on cleavage surfaces of single crystals, the measurements of the absorption and reflectance spectra (E=0.040.8eV), electrical resistivity, and magnetic susceptibility were carried out for determination of peculiarities of the fundamental absorption spectrum and the conductivity mechanism in CaMnO3δ single crystals. The energy of fundamental absorption edge associated with the direct transitions was determined as Eg=1.55eV. The absorption band with two maxima at 2.2 and 3.1eV corresponding to the charge transfer transitions was revealed. The polaron band at 0.7eV was discovered and polaron parameters were determined. Peculiarities of IR absorption and dc conductivity of CaMnO3δ in dependence on oxygen stoichiometry are determined by the superposition of hopping and band conductivity of spin-lattice polarons, and by additional localization of charge carriers under oxygen vacancies ordering.

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  • Received 9 June 2004

DOI:https://doi.org/10.1103/PhysRevB.70.224406

©2004 American Physical Society

Authors & Affiliations

N. N. Loshkareva, L. V. Nomerovannaya, E. V. Mostovshchikova, A. A. Makhnev, Yu. P. Sukhorukov, N. I. Solin, T. I. Arbuzova, S. V. Naumov, and N. V. Kostromitina

  • Institute of Metal Physics, 620219 Ekaterinburg, Russia

A. M. Balbashov and L. N. Rybina

  • Moscow Power Engineering Institute, 105835 Moscow, Russia

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Vol. 70, Iss. 22 — 1 December 2004

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