Flux-Line Lattice Structures in Untwinned YBa2Cu3O

Details Flux-Line Lattice Structures in Untwinned YBa2Cu3O Flux-Line Lattice Structures in Untwinned YBa2Cu3O

1998-04-15

arxiv.org/abs/cond-mat/9804159v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.82.2792

A small angle neutron scattering study of the flux-line lattice in a large single crystal of untwinned YBa2Cu3O is presented. In fields parallel to the c-axis, diffraction spots are observed corresponding to four orientations of a hexagonal lattice, distorted by the a-b anisotropy. A value for the anisotropy, the penetration depth ratio, of 1.18(2) was obtained. The high quality of the data is such that second order diffraction is observed, indicating a well ordered FLL. With the field at 33 degrees to c a field dependent re-orientation of the lattice is observed around 3T.

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