Muon-spin rotation measurements of the vortex state in Sr2RuO4 : type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice
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Muon-spin rotation has been used to probe the vortex state in Sr2RuO4. At moderate fields and temperatures a lattice of triangular symmetry is observed, crossing over to a lattice of square symmetry with increasing field and temperature. At lower fields it is found that there are large regions of the sample that are completely free from vortices which grow in volume as the temperature falls. Importantly this is accompanied by increasing vortex density and increasing disorder within the vortex-cluster-containing regions. Both effects are expected to result from the strongly temperature-dependent long-range vortex attractive forces arising from the multiband chiral-order superconductivity.
Ray , S J , Gibbs , A S , Bending , S J , Curran , P J , Babaev , E , Baines , C , Mackenzie , A P & Lee , S L 2014 , ' Muon-spin rotation measurements of the vortex state in Sr 2 RuO 4 : type-1.5 superconductivity, vortex clustering, and a crossover from a triangular to a square vortex lattice ' Physical Review. B, Condensed matter and materials physics , vol 89 , no. 9 , 094504 . DOI: 10.1103/PhysRevB.89.094504
Physical Review. B, Condensed matter and materials physics
© 2014 American Physical Society
The authors acknowledge the financial support of the EPSRC (Grant No. EP/J01060X). All μSR experiments were carried out courtesy of the Paul Scherrer Institute. E. Babaev was supported by the US NSF CAREER Award No. DMR-0955902 and by the Knut and Alice Wallenberg Foundation through the Royal Swedish Academy of Sciences, Swedish Research Council.
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