Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems

Details Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems Effects of nonmagnetic impurities on optical conductivity in strongly correlated systems

1999-07-03

arxiv.org/abs/cond-mat/9907050v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 11pages, 4 figures

Scientific paper

10.1103/PhysRevB.60.15504

Effects of nonmagnetic impurities on optical conductivity in the systems of antiferromagnetically correlated electrons are examined based on the Lanczos exact diagonalization scheme. As a result of resonant scattering a low-frequency peak in the optical conductivity is predicted to occur in the presence of the nonmagnetic impurities, which is consistent with the observed normal-state optical conductivity of ${\rm YBa_2}({\rm Cu}_{1-x}{\rm Zn}_x)_3{\rm O}_{7-\delta}$. In addition, a relatively high and broad peak is found to occur at a high frequency region as a consequence of the Heisenberg interaction between electrons, in agreement with observation in the peak position.

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