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Fermi surface and order parameter driven vortex lattice structure transitions in twin-free YBa2Cu3O7.

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author White J S, Hinkov V, Heslop R W, Lycett R J, Forgan E M, Bowell C, Strässle S, Abrahamsen A B, Laver M, Dewhurst C D, Kohlbrecher J, Gavilano J L, Mesot J, Keimer B, Erb A,
Project Interplay of Magnetism and Superconductivity in Unconventional Superconductors
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Original article (peer-reviewed)

Journal Physical review letters
Volume (Issue) 102(9)
Page(s) 097001 - 097001
Title of proceedings Physical review letters

Abstract

We report on small-angle neutron scattering studies of the intrinsic vortex lattice (VL) structure in detwinned YBa2Cu3O7 at 2 K, and in fields up to 10.8 T. Because of the suppressed pinning to twin-domain boundaries, a new distorted hexagonal VL structure phase is stabilized at intermediate fields. It is separated from a low-field hexagonal phase of different orientation and distortion by a first-order transition at 2.0(2) T that is probably driven by Fermi surface effects. We argue that another first-order transition at 6.7(2) T, into a rhombic structure with a distortion of opposite sign, marks a crossover from a regime where Fermi surface anisotropy is dominant, to one where the VL structure and distortion is controlled by the order-parameter anisotropy.
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