Thermodynamics of the static approximation in the degenerate Hubbard model
- 1 March 1985
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 31 (5) , 3104-3105
- https://doi.org/10.1103/physrevb.31.3104
Abstract
The thermodynamics of the static approximation in both the two-field and the vector-field functional integral methods is investigated for the degenerate Hubbard model in the atomic limit. It is shown that the two-field method describes better the thermodynamics of the system; the vector-field method leads to a negative specific heat and unphysical magnetic entropy for temperatures at which the Hund’s-rule coupling is dominant.Keywords
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