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.
Журнал: JETP LETTERS
Выпуск журнала: Vol. 56, Is. 4
Номера страниц: 203-206
ISSN журнала: 00213640
Место издания: WOODBURY
Издатель: AMER INST PHYSICS