PSEUDOSYMMETRY IN CRYSTALLINE COMPOUNDS WITH HIGHLY SYMMETRIC SUBLATTICES
A. S. Poplavnoi
Keywords: pseudosymmetry, electron density, Bravais sublattices, elementary excitation spectra
Abstract
The features of pseudosymmetry in crystalline compounds with highly symmetric sublattices are discussed. The symmetry of sublattices higher than the crystal symmetry is manifested in elementary excitation spectra in the form of degenerations and quasidegenerations. The topology of spectral branches is not related to the value of the parameter estimating the degree of pseudosymmetry on the basis of the electron density fraction, which is invariant with respect to operations corresponding to additional symmetry.
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