Magnetic Properties of the t-J Model in the Dynamical Mean-Field Theory

Details Magnetic Properties of the t-J Model in the Dynamical Mean-Field Theory Magnetic Properties of the t-J Model in the Dynamical Mean-Field Theory

1995-12-12

arxiv.org/abs/cond-mat/9512096v1

J. Phys.: Condens. Matter 8(1996) 3161

Physics

Condensed Matter

28 pages LaTeX, postscript figures as compressed and uuencoded file included file

Scientific paper

10.1088/0953-8984/8/18/009

We present a theory for the spin correlation function of the t-J model in the framework of the dynamical mean-field theory. Using this mapping between the lattice and a local model we are able to obtain an intuitive expression for the non-local spin susceptibility, with the corresponding local correlation function as input. The latter is calculated by means of local Goldstone diagrams following closely the procedures developed and successfully applied for the (single impurity) Anderson model.We present a systematic study of the magnetic susceptibility and compare our results with those of a Hubbard model at large U. Similarities and differences are pointed out and the magnetic phase diagram of the t-J model is discussed.

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