Search for spontaneous edge currents and vortex imaging in Sr2RuO4 mesostructures

P. J. Curran*, S. J. Bending, W. M. Desoky, A. S. Gibbs, S. L. Lee, A. P. Mackenzie

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

63 Citations (Scopus)
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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 dˆ = Δ0(kx ± iky ) zˆ. 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 ∼ 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
Number of pages6
JournalPhysical Review. B, Condensed matter and materials physics
Volume89
Issue number14
DOIs
Publication statusPublished - 9 Apr 2014

Keywords

  • High-temperature superconductors
  • Disks
  • Barriers
  • Surface

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