Abstract
To clarify the property of Mott transition in the strong correlation limit, we investigate the infinite- U Hubbard model using high-temperature expansion method. The free energies in various lattices are obtained as a function of inverse temperature and electron density. If we assume the low temperature behavior as S ∝ T , we can extrapolate the series down to T = 0 with remarkable accuracy and find that the specific heat coefficient γ diverges with n → 1 . Furthermore, it is revealed that the divergence is scaled as γ ∝ ( 1 - n ) - x with x ∼ 1.7 – 1.8 , which is almost irrespective of lattice structure.
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