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Quasiparticle Interference in a Superconducting State with a Fourfold Phase Change

100%
Pisarski P., Harań G.
Acta Physica Polonica A
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2007
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vol. 111
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issue 5
791-794
EN
Quantum interference revealed in Bi_2Sr_2Ca Cu_2O_{8+δ} by Fourier transform scanning spectroscopy is primarily determined by maxima of the joint density of states which correspond to an octet of scattering wave vectors connecting points at the constant quasiparticle energy contours where the density of states is maximal. We consider a superconductor with a constant quasiparticle density of states where the interference is due to the fourfold change in the phase of the order parameter. Our results may be helpful in a discussion of the interference in a d-wave superconductor at the tunneling energy exceeding the gap magnitude.
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d-Wave Superconductivity in a System with Open Boundary Conditions

100%
Pisarski P., Harań G.
Acta Physica Polonica A
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2004
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vol. 106
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issue 5
721-725
EN
We discuss the d-wave superconductivity in confined geometry by imposing open boundary conditions on the attractive Hubbard model. Within the Bogoliubov-de Gennes approach we evaluate the order parameter and charge density distribution in the system.
3
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Resonant States of a Momentum-Dependent Impurity Potential in a d-Wave Superconductor

100%
Pisarski P., Harań G.
Acta Physica Polonica A
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2008
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vol. 114
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issue 1
153-157
EN
Nonmagnetic impurity on-site potential leads to the resonant states in a d-wave superconductor for the unitary scattering limit. We extend the above study to include a momentum dependence of the impurity potential and discuss the existence and number of resonant states for a tetragonal anisotropy of the scattering potential.
4
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s-Wave Order Parameter in the Presence of a Momentum-Dependent Impurity Scattering Potential

81%
Rudzińska D., Pisarski P., Harań G.
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EN
Momentum dependence of the impurity potential leads to the anisotropy of a local density of states in isotropic s-wave superconductors. We complete this result by discussing the influence of a momentum-dependent impurity potential on the s-wave order parameter. The scattering process is considered in the T-matrix approximation, and the model impurity potential consists of two separate terms representing isotropic (on-site) and anisotropic (momentum-dependent) parts of the potential. We show that the effect of the isotropic part on the order parameter is local whereas the influence of the momentum-dependent term is nonlocal.
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