Spectral properties of quasiparticle excitations induced by magnetic moments in superconductors
M. I. Salkola, A. V. Balatsky, J. R. Schrieffer
DOI 10.1103/PhysRevB.55.12648 · 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
The consequences of localized, classical magnetic moments in superconductors are explored and their effect on the spectral properties of the intragap bound states is studied. Above a critical moment, a localized quasiparticle excitation in an s-wave superconductor is spontaneously created near a magnetic impurity, inducing a zero-temperature quantum transition. In this transition, the spin quantum number of the ground state changes from zero to , while the total charge remains the same. In contrast, the spin-unpolarized ground state of a d-wave superconductor is found to be stable for any value of the magnetic moment when the normal-state energy spectrum possesses particle-hole symmetry. The effect of impurity scattering on the quasiparticle states is interpreted in the spirit of relevant symmetries of the clean superconductor. The results obtained by the non-self-consistent (T matrix) and the self-consistent mean-field approximations are compared and qualitative agreement between the two schemes is found in the regime where the coherence length is longer than the Fermi length.
Similar papers
Impurity-induced quantum phase transitions and magnetic order in conventional superconductors: Competition between bound and quasiparticle states
similarity 0.93Silas Hoffman et al.
Source status unknown — claims are unverified
Tunneling spectra of impurity states in unconventional superconductors
similarity 0.91P. O. Sukhachov et al.
Source status unknown — claims are unverified
Superconductivity in a high magnetic field: Excitation spectrum and tunneling properties
similarity 0.91Saša Dukan & Zlatko Tešanović
Source status unknown — claims are unverified
Solitonic in-gap modes in a superconductor-quantum antiferromagnet interface
similarity 0.90J. L. Lado & M. Sigrist
Source status unknown — claims are unverified
Collisionless dynamics of the superconducting gap excited by a spin-splitting field
similarity 0.90V. Plastovets et al.
Source status unknown — claims are unverified
Transport properties of anisotropic superconductors: Influence of arbitrary electron-impurity phase shifts
similarity 0.90B. Arfi et al.
Source status unknown — claims are unverified