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Thermodynamics of a Two‐Band Hubbard Model
Author(s) -
Steeb W.H.,
Marsch E.
Publication year - 1974
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.2220650139
Subject(s) - hubbard model , simple (philosophy) , condensed matter physics , thermodynamics , lattice (music) , phase transition , band gap , electronic band structure , statistical physics , physics , function (biology) , energy (signal processing) , quantum mechanics , superconductivity , philosophy , epistemology , evolutionary biology , acoustics , biology
Abstract Using a variational principle the approximate free energy of a simple two‐band Hubbard model is calculated. Numerical results are presented for the simple cubic lattice and these are given for the free energy, chemical potential, and energy gap as function of temperature. The values are compared with those of Dichtel et al. By introduction of a second band a lower transition temperature T N is obtained. The system shows a second‐order phase transition.