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

Abstract

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.

4 pages, 4 figures

References in corpus (1)

• Extended Gapless Regions in Disordered d_{x^2-y^2}-Wave Superconductors

Cited by in corpus (7)

• Quantum impurity dynamics in two-dimensional antiferromagnets and superconductors
• Inhomogeneous d-wave superconducting state of a doped Mott insulator
• Quasiparticle properties around a nonmagnetic impurity in the superconducting state of the two-dimensional t-J model
• Quasiparticle Resonant States Induced by a Unitary Impurity in a d-Wave Superconductor
• On Local Symmetric Order Parameters of Vortex Lattice States
• Current patterns and magnetic impurities in time-reversal breaking superconductor
• Effect of spin-orbit impurity scattering in the superconducting state of t-J model