Journal
PHYSICAL REVIEW B
Volume 84, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.84.104507
Keywords
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Funding
- Engineering and Physical Sciences Research Council (EPSRC) in the United Kingdom [EP/D034264/1, EP/E039944/1]
- Engineering and Physical Sciences Research Council [EP/I031014/1, EP/F044704/1, EP/D034264/1, EP/E064264/1, EP/E039944/1] Funding Source: researchfish
- EPSRC [EP/E039944/1, EP/I031014/1, EP/F044704/1, EP/E064264/1, EP/D034264/1] Funding Source: UKRI
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Scanning Hall probe microscopy has been used to study vortex structures in very-high-quality single crystals of the unconventional superconductor Sr2RuO4 (T-c congruent to 1.5 K). In none of our samples do we find credible evidence for the existence of the spontaneous fields or chiral domains predicted for the expected time-reversal symmetry-breaking order parameter. Even in our highest-quality samples we observe very strong vortex pinning and anomalous broadening of vortex profiles. The best samples also exhibit a clear field-driven triangular to square vortex lattice transition at low fields, as predicted by extended London theory calculations. In stark contrast, slightly less well-ordered samples exhibit pronounced vortex chaining/banding that we tentatively attribute to an extrinsic source of disorder.
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