Observation of a Triangular to Square Flux Lattice Phase Transition in YBCO

Details Observation of a Triangular to Square Flux Lattice Phase Transition in YBCO Observation of a Triangular to Square Flux Lattice Phase Transition in YBCO

2003-08-21

arxiv.org/abs/cond-mat/0308424v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.92.067004

We have used the technique of small-angle neutron scattering to observe magnetic flux lines directly in an YBCO single crystal at fields higher than previously reported. For field directions close to perpendicular to the CuO2 planes, we find that the flux lattice structure changes smoothly from a distorted triangular co-ordination to nearly perfectly square as the magnetic induction approaches 11 T. The orientation of the square flux lattice is as expected from recent d-wave theories, but is 45 deg from that recently observed in LSCO.

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