Pair breaking mechanisms by impurities are investigated in the two-dimensional t-J model by exact diagonalization techniques. Analysis of binding energies and quasiparticle weight of pairs shows that nonmagnetic impurities are more effective in suppressing pairing than magnetic ones in agreement with experimental studies of Zn- and Ni-substituted high- ${\mathit{T}}_{\mathit{c}}$ superconductors. Besides, we determine how the localization of holes contributes to the suppression of pairing. Finally, we examine the effect of impurities on the magnetic order by computing the dynamical spin susceptibility. \textcopyright{} 1996 The American Physical Society.Pair breaking mechanisms by impurities are investigated in the two-dimensional t-J model by exact diagonalization techniques. Analysis of binding energies and quasiparticle weight of pairs shows that nonmagnetic impurities are more effective in suppressing pairing than magnetic ones in agreement with experimental studies of Zn- and Ni-substituted high-${\mathit{T}}_{\mathit{c}}$ superconductors. Besides, we determine how the localization of holes contributes to the suppression of pairing. Finally, we examine the effect of impurities on the magnetic order by computing the dynamical spin susceptibility. \textcopyright{} 1996 The American Physical Society.

arXiv:cond-mat/9510028Physical review. B, Condensed matterSep 1, 199613 citations

Spin and Charge Excitations in the 2D t-J Model

W. O. Putikka, Marco U. Luchini, R. R. P. Singh

APSMar 1, 20000 citations

Spin gap of the one-dimensional t–J model

Y. C. Chen

Physica C SuperconductivityNov 1, 20010 citations

{\mathit{T}}_{\mathit{c}}

superconductors. Besides, we determine how the localization of holes contributes to the suppression of pairing. Finally, we examine the effect of impurities on the magnetic order by computing the dynamical spin susceptibility. \textcopyright{} 1996 The American Physical Society.