PARAMAGNETIC-SUSCEPTIBILITY AND PARAMAGNET-FERROMAGNET CROSSOVER IN THE GROUND-STATE OF THE U=INFINITY HUBBARD-MODEL

Описание

Тип публикации: статья из журнала

Год издания: 1992

Аннотация: The paramagnetic susceptibility chi(0,0) = dR (H)/dH (H --> 0, U = infinity) of the Hubbard model is calculated in second order in the kinematic interaction. The result found radically changes the conclusion, which follows from the theory of first order in the kinematic field, that there is a paramagnetic instability at T = 0. The Показать полностьюexpression for chi(0,0) agrees with the Pauli susceptibility in the gas limit (n --> 0). It describes a pronounced correlation enhancement (by a factor almost-equal-to 5) at an intermediate filling (n almost-equal-to 0.5). It describes a crossover to a ferromagnetic state at the point n almost-equal-to 0. 83 for rho(E) = rho = 1/2 W.

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Издание

Журнал: JETP LETTERS

Выпуск журнала: Vol. 56, Is. 4

Номера страниц: 203-206

ISSN журнала: 00213640

Место издания: WOODBURY

Издатель: AMER INST PHYSICS

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