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The thermodynamic properties of specific heat, entropy, chemical potential, spin susceptibility ₒ, and charge susceptibility ₂ are studied as functions of temperature and doping within the two-dimensional Hubbard model with various U/t=4--12. Quantities are calculated using the finite-temperature Lanczos method with additional phase averaging for a system of 44 sites. Results show that the entropy at low T reaches a maximum near half-filling at the electron density n10. 15 in the whole regime of studied U/t. The pseudogap in ₒ (T) becomes clearly pronounced for U/t>~8 while ₂ shows a maximum close to half-filling. The relation of results to those within the t-J model and to experiments is discussed.
Bonča et al. (Fri,) studied this question.
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