Search for spontaneous edge currents and vortex imaging in Sr2RuO4 mesostructures

Peter Curran, S J Bending, Waled Desoky, Alex S Gibbs, Steve L Lee, Andy K Mackenzie

Research output: Contribution to journalArticle

41 Citations (Scopus)
167 Downloads (Pure)

Abstract

Scanning Hall probe microscopy has been used to search for spontaneous fields at the well-defined edges of large mesoscopic disks, etched into the ab surface of very high quality single crystal Sr2RuO4. Such fields are predicted to exist at locations of broken translational symmetry as a consequence of the proposed two-component spin-triplet chiral order parameter (d) over cap = Delta(0)(k(x) +/- ik(y))(z) over cap. We find no evidence for such fields and impose an upper limit of +/-2.5 mG on their magnitude. We do, however, observe an abrupt apparent loss of strong bulk pinning and a change in the screening behavior above H similar to 25 Oe. At high fields (H > 25 Oe) pronounced magnetic screening by the disks is very well described by a model containing only strong edge currents, and bulk critical currents do not appear to play a significant role. Our results are discussed in terms of relevant theoretical predictions.
Original languageEnglish
Article number144504
JournalPhysical Review B : Condensed Matter and Materials Physics
Volume89
DOIs
Publication statusPublished - 9 Apr 2014

Keywords

  • High temperature superconductors
  • Disks
  • Barriers
  • Surface

Fingerprint Dive into the research topics of 'Search for spontaneous edge currents and vortex imaging in Sr<sub>2</sub>RuO<sub>4</sub> mesostructures'. Together they form a unique fingerprint.

  • Projects

  • Cite this