Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors

M. H S Amin, A. N. Omelyanchouk, Sergey Rashkeev, M. Coury, A. M. Zagoskin

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We investigate the properties of spontaneous currents generated at surfaces and interfaces of d-wave supercondtors using the self-consistent quasiclassical Eilenberger equations. The influence of the roughness and reflectivity of the boundaries on the spontaneous current are studied. We show that these have very different effects at the surfaces compared to the interfaces, which reflects the different nature of the time reversal symmetry breaking states in these two systems. We find a signature of the "anomalous proximity effect" at rough d-wave interfaces. We also show that the existence of a subdominant order parameter, which is necessary for time reversal symmetry breaking at the surface, suppresses the spontaneous current generation due to proximity effect at the interface between two superconductors. We associate orbital moments to the spontaneous currents to explain the "superscreening" effect, which seems to be present at all ideal d-wave surfaces and interfaces, where dxy is the favorite subdominant symmetry.

Original languageEnglish
Pages (from-to)162-179
Number of pages18
JournalPhysica B: Condensed Matter
Volume318
Issue number2-3
DOIs
Publication statusPublished - 1 Jun 2002
Externally publishedYes

Fingerprint

Superconducting materials
broken symmetry
Surface waves
Surface roughness
surface waves
roughness
signatures
moments
reflectance
orbitals
symmetry

Keywords

  • D-wave superconductivity
  • Grain boundary
  • Josephson junction
  • Proximity effect
  • Spontaneous

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors. / Amin, M. H S; Omelyanchouk, A. N.; Rashkeev, Sergey; Coury, M.; Zagoskin, A. M.

In: Physica B: Condensed Matter, Vol. 318, No. 2-3, 01.06.2002, p. 162-179.

Research output: Contribution to journalArticle

Amin, M. H S ; Omelyanchouk, A. N. ; Rashkeev, Sergey ; Coury, M. ; Zagoskin, A. M. / Quasiclassical theory of spontaneous currents at surfaces and interfaces of d-wave superconductors. In: Physica B: Condensed Matter. 2002 ; Vol. 318, No. 2-3. pp. 162-179.
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