On the derivation of the t-J model: electron spectrum and exchange interactions in narrow energy bands

Дата и время публикации : 1997-05-06T13:10:39Z

Авторы публикации и институты :
V. Yu. Irkhin

Ссылка на журнал-издание: Phys. Rev. B, 57 (1998) 13375
Коментарии к cтатье: 4 pages, RevTeX
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: A derivation of the t-J model of a highly-correlated solid is given starting from the general many-electron Hamiltonian with account of the non-orthogonality of atomic wave functions. Asymmetry of the Hubbard subbands (i.e. of “electron” and “hole”cases) for a nearly half-filled bare band is demonstrated. The non-orthogonality corrections are shown to lead to occurrence of indirect antiferromagnetic exchange interaction even in the limit of the infinite on-site Coulomb repulsion. Consequences of this treatment for the magnetism formation in narrow energy bands are discussed. Peculiarities of the case of “frustrated” lattices, which contain triangles of nearest neighbors, are considered.

Category: Physics