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CPA treatment of the extended Hubbard model
Author(s) -
Mizia J.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220840207
Subject(s) - antiferromagnetism , condensed matter physics , hamiltonian (control theory) , degenerate energy levels , paramagnetism , physics , hubbard model , constant (computer programming) , density of states , quantum mechanics , superconductivity , mathematics , mathematical optimization , computer science , programming language
The Hamiltonian for a completely degenerate d‐band including intra‐atomic Coulomb and exchange interactions is studied using the two‐sublattice alloy analogy method. The density of states and the criterion for the appearance of antiferromagnetism are calculated by this method. At the transition from paramagnetism to antiferromagnetism the energy gap appears. The interaction constant required to produce antiferromagnetism tends to zero at the maxima of the state density function.