The orbital relaxation: a possible origin of t-J model with large J

Details The orbital relaxation: a possible origin of t-J model with large J The orbital relaxation: a possible origin of t-J model with large J

1993-12-20

arxiv.org/abs/cond-mat/9312075v1

Physics

Condensed Matter

7 pages, plain Tex version 2.93, 2 figures available upon request via mail/fax (no local report #)

Scientific paper

10.1016/0038-1098(94)90730-7

Whereas the t-J model has gained wide popularity among physicists as a model for high-T_C superconductivity, its physical origin is not at all clear. In this communication we show that the Hubbard model with occupation-dependent hopping (t_1-t_2-t_3-U model), recently proposed to account for the relaxation of doubly-occupied orbitals, reduces, in a physically relevant parameter region, to an effective t-J-t' model with no upper bound on the J/t ratio. Results of exact diagonalization studies on finite size systems demonstrate the equivalence between the t_1-t_2-t_3-U model with intermediate/large U and the t-J-t' model even for very large J/t ratio (up to 16). On the contrary, t-U and t-J models turn out to be equivalent to t-J-t' model only for very small J values (J much smaller than t). Implications of the results on high-T_C superconductivity are briefly discussed.

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