'Pi State' Induced by Impurities with a Repulsive Interaction

Abstract

We study the properties of a quantum impurity embedded in a superconducting host. The superconductor is described by the negative U Hubbard model while the impurity introduces a repulsive interaction to the system. We discuss the influence of this `on-impurity' Coulomb repulsion on the local properties (density of states, electron pairing) of the superconductor. We show the condition of pi - like behaviour, defined as two subsystems having a phase difference of pi, in the system by using a proper combination of attractive pairing interaction and repulsive one located at impurity site.

5 pages, 4 figures, to be published in Physica Status Solidi B

References in corpus (8)

• Andreev bound states in high-$T_c$ superconducting junctions
• Phase coherent transport in hybrid superconducting nanostructures
• Kondo effect of impurity moments in d-wave superconductors: Quantum phase transition and spectral properties
• Paramagnetic instability at normal-metal - superconductor interfaces
• Quasiparticle properties around a nonmagnetic impurity in the superconducting state of the two-dimensional t-J model
• Superconducing Alloys with Weak and Strong Scattering: Anderson's Theorem and a Superconductor-Insulator Transition
• The Critical Hopping Parameter in O(a) improved Lattice QCD
• Van Hove Singularity and Superconductivity in Disordered Hubbard Model

Cited by in corpus (2)

• Superconducting Pairing Amplitude and Local Density of States in Presence of Repulsive Centers
• Properties of the $\pi$ state induced by impurities in a d-wave superconductor