Mechanisms of spontaneous current generation in an inhomogeneous d-wave superconductor

M. H. S. Amin; A. N. Omelyanchouk; A. M. Zagoskin

doi:10.1103/PhysRevB.63.212502

← Back to search

Mechanisms of spontaneous current generation in an inhomogeneous d-wave superconductor

M. H. S. Amin, A. N. Omelyanchouk, A. M. Zagoskin

DOI 10.1103/PhysRevB.63.212502 · Physical Review B

T1

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

A boundary between two d-wave superconductors or an s-wave and a d-wave superconductor generally breaks time-reversal symmetry and can generate spontaneous currents due to proximity effect. On the other hand, surfaces and interfaces in d-wave superconductors can produce localized current-carrying states by supporting the T-breaking combination of dominant and subdominant order parameters. We investigate spontaneous currents in the presence of both mechanisms and show that at low temperatures, counterintuitively, the subdominant coupling decreases the amplitude of the spontaneous current due to the proximity effect. Superscreening of spontaneous currents is demonstrated to be present in any ideal d−d (but not s−d) junction and surface with d+id′ order parameter symmetry. We show that this superscreening is the result of contributions from the local magnetic moment of the condensate to the spontaneous current.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown