Phys. Rev. B 72, 012504 (2005) [4 pages]Scanning magnetic imaging of Sr2RuO4Received 14 March 2005; published 11 July 2005 We magnetically imaged the ab-plane surface of single crystals of the unconventional superconductor Sr2RuO4, including one sample with an array of microholes, using scanning superconducting quantum interference device and Hall probe microscopy in a dilution refrigerator at low applied magnetic fields. The images show dilute trapped vortices, as would be expected in conventional type-II superconductors, and no other magnetic features. We found no direct signs of the spontaneous magnetization that would be expected in a time-reversal symmetry-breaking (TRSB) superconductor. These measurements set upper limits on the presence of TRSB signatures in this material. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.012504
DOI:
10.1103/PhysRevB.72.012504
PACS:
74.20.Rp, 74.70.Pq
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