Study on nonmagnetic impurities in the superconducting state of two-dimensional t-J model

Details Study on nonmagnetic impurities in the superconducting state of two-dimensional t-J model Study on nonmagnetic impurities in the superconducting state of two-dimensional t-J model

1998-04-07

arxiv.org/abs/cond-mat/9804076v1

Int. J. Mod. Phys. Vol.24, 2447 (1998)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1142/S0217979298001435

We study the effect of nonmagnetic impurities in the superconducting state of the t-J model. The Bogoliubov de Gennes equation is derived using a slave-boson mean-field approximation, and we solve it numerically at T=0. The d_{x^2-y^2}-wave order parameter is suppressed near an impurity and its spatial variation induces the extended s-wave component. We also find the local charge density wave (CDW)-like feature due to the Friedel oscillations. This leads to the splitting of the expected zero-energy Andreev bound state. Therefore the system is unlikely introducing a localized state of other symmetry such as superconductivity with broken time reversal symmetry or antiferromagnetism.

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