By Professor Dr. Nobuo Tsuda, Professor Dr. Keiichiro Nasu, Professor Dr. Akira Yanase, Dr. Kiiti Siratori (auth.)

ISBN-10: 3662026686

ISBN-13: 9783662026687

ISBN-10: 3662026708

ISBN-13: 9783662026700

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It is usually called the polaron radius, and in the case of large T, T ~ w, this radius becomes much larger than the lattice constant. For this reason, we call this type of polaron a large polaron. Although the above-mentioned results are only concerned with intramolecular phonons, the main conclusions are essentially the same for any other modes. Trapping, Broken Symmetry and Dimensionality Let us proceed to the strong region of e-ph coupling, 8 ~ T. In the previous section, we have seen that the mass enhancement occurs because of e-ph coupling.

Thus Mx W03 may be considered as a metal perturbed by the randomness. The metallic bronzes show supercondUctivity. 2. 33. 83]. The transition temperature and the screening of the Coulomb interaction depend sensitivelyon the carrier density because the conduction band of Na x W03 has two dimensional character even though the lattice is three dimensional. Depending on the carrier density the color changes from blue to red. For instance W03 is pale green while H x W03 is blue. When W03 is biased negatively in a proton atmosphere such as in a liquid or solid electrolyte, protons diffuse into the bulk and it turns blue.

This result shows that the mean field theory cannot describe the excited states correctly, at least in MnO, FeO, CoO, and NiO. These insulators are weIl known magnetic substances and the localized orbital may be a better approximation of the 3d electrons though an isolated atomic d orbital may be too simple even as a first approximation. 8. 202]. They are the radii in a high spin state, HS. In HS, electtons occupy the orbitals as in an isolated atom following Hund's rule. For instance five 3d electrons enter as (de)3(d"()2 and S = 5/2.

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Electronic Conduction in Oxides by Professor Dr. Nobuo Tsuda, Professor Dr. Keiichiro Nasu, Professor Dr. Akira Yanase, Dr. Kiiti Siratori (auth.)

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