Ground State Properties of the Two-Dimensional t-J Model

Дата и время публикации : 1996-10-09T12:54:09Z

Авторы публикации и институты :
Masanori Kohno

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 15 pages, RevTex, 12 PostScript figures, to appear in Phys.Rev.B
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: The two-dimensional $t$-$J$ model in the ground state is investigated by the power Lanczos method. The pairing-pairing correlation function for $d_{x^2-y^2}$-wave symmetry is enhanced in the realistic parameter regime for high-$T_c$ superconductors. The charge susceptibility $chi_c$ shows divergent behavior as $chi_cproptodelta^{-1}$ near half-filling for the doping concentration $delta$, indicating that the value of the dynamical exponent $z$ is four under the assumption of hyperscaling. The peak height of the spin structure factor $S_{max}(Q)$ also behaves as $S_{max}(Q) proptodelta^{-1}$ near half-filling, which leads to the divergence of the antiferromagnetic correlation length $xi_m$ as $xi_m proptodelta^{-1/2}$. The boundary of phase separation is estimated on the basis of the Maxwell construction. Numerical results are compared with experimental features observed in high-$T_c$ cuprates.

Category: Physics