Journal
PHYSICAL REVIEW B
Volume 78, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.174513
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Funding
- Engineering and Physical Sciences Research Council of the U.K.
- Institut Laue-Langevin
- University of Birmingham
- European Commission
- European Research Area [RII3-CT-2003505925]
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We have mapped out the high-field phase diagram of the vortex lattice in lightly twinned YBa(2)Cu(3)O(7) by employing small-angle neutron scattering. This extends previous measurements [S. P. Brown , Phys. Rev. Lett. 92, 067004 (2004)] in which we reported a transition in local flux-line coordination from distorted triangular to square as a function of field applied parallel to the crystal c axis. At high fields, we observe a transition back to triangular coordination with increasing angle between the applied field and c axis or with increasing temperature. At lower fields, our results may be interpreted in terms of a field-induced reduction of the basal-plane a-b anisotropy. Tilting the flux lines away from the c axis reduces the pinning by twin planes, changes the orientation of the vortex lattice nearest-neighbor directions, and the transition between square and hexagonal vortex lattices becomes first order.
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