Effects of extended impurity perturbation in a d-wave superconductor
Yu. G. Pogorelov, M. C. Santos
DOI 10.1103/PhysRevB.71.014516 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We describe the effects of electronic perturbation distributed on nearest-neighbor sites to the impurity center in a planar d-wave superconductor, in approximation of circular Fermi surface. The behavior previously reported for pointlike perturbation and square Fermi surface, the quasiparticle density of states ρ(ε) can display a resonance inside the gap and asymptotically vanishes at ε→0 as ρ∼ε∕ln2ε. Unique features are weak antiresonances from low-symmetry representations of nonlocal perturbation. The local suppression of superconducting (SC) order parameters in this model is found to be somewhat weaker than for an equivalent pointlike (nonmagnetic) perturbation and much weaker than for a spin-dependent (extended) perturbation. The developed approach can be used for a wide class of nonlocal impurity perturbations in superconductors.
Similar papers
Effects of phase coherence on local density of states in superconducting proximity structures
similarity 0.89Shu-Ichiro Suzuki et al.
Source status unknown — claims are unverified
Superconducting order parameter π-phase shift in magnetic impurity wires
similarity 0.89Kristofer Björnson et al.
Source status unknown — claims are unverified
Impurity-induced subgap states in superconductors with inhomogeneous pairing
similarity 0.89A. A. Bespalov
Source status unknown — claims are unverified
Superconducting state in a crystal of low symmetry: Impurity effect in an extended s-wave superconductor with nodes in the excitation gap
similarity 0.89K. Yamashita & D. S. Hirashima
Source status unknown — claims are unverified
Quasiparticle mirages in the tunneling spectra of d-wave superconductors
similarity 0.89I. Paul et al.
Source status unknown — claims are unverified
Superconducting gap renormalization around two magnetic impurities: From Shiba to Andreev bound states
similarity 0.88Tobias Meng et al.
Source status unknown — claims are unverified