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Thermodynamic properties of uniform and dimerized hubbard chains
Author(s) -
Lorenz B.
Publication year - 1983
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.2221190215
Subject(s) - hubbard model , moment (physics) , condensed matter physics , thermodynamics , dimension (graph theory) , cluster (spacecraft) , magnetic moment , physics , statistical physics , chemistry , materials science , mathematics , quantum mechanics , combinatorics , superconductivity , computer science , programming language
The thermodynamics of the uniform and dimerized half‐filled Hubbard chains is investigated within an approximation which takes into account the correlations in a given cluster of sites and which is valid for all model parameters and for all temperatures. The dependence of the specific heat on temperature changes from a one‐peak to a two‐peak structure with increasing interaction strength. The influence of dimerization is discussed. The local magnetic moment is found to decrease with increasing temperature in the high‐temperature region. It is suggested that this qualitative behaviour is more general and independent on dimension and band filling.