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Phys. Rev. Lett. 103, 017001 (2009) [4 pages]

Magnetic-Field-Enhanced Incommensurate Magnetic Order in the Underdoped High-Temperature Superconductor YBa2Cu3O6.45

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D. Haug1, V. Hinkov1,*, A. Suchaneck1, D. S. Inosov1, N. B. Christensen2,3,4, Ch. Niedermayer2, P. Bourges5, Y. Sidis5, J. T. Park1, A. Ivanov6, C. T. Lin1, J. Mesot2,7, and B. Keimer1
1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
2Laboratory for Neutron Scattering, ETH Zürich & Paul Scherrer Institut, CH-5232 Villigen, Switzerland
3Materials Research Division, Risø DTU, Technical University of Denmark, DK-4000 Roskilde, Denmark
4Nano-Science Center, Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
5Laboratoire Léon Brillouin, CEA-CNRS, CEA-Saclay, F-91191 Gif-sûr-Yvette, France
6Institut Laue-Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble Cedex 9, France
7Institut de Physique de la Matière Complexe, EPFL, CH-1015 Lausanne, Switzerland

Received 21 January 2009; published 29 June 2009

We present a neutron-scattering study of the static and dynamic spin correlations in the underdoped high-temperature superconductor YBa2Cu3O6.45 in magnetic fields up to 15 T. The field strongly enhances static incommensurate magnetic order at low temperatures and induces a spectral-weight shift in the magnetic-excitation spectrum. A reconstruction of the Fermi surface driven by the field-enhanced magnetic superstructure may thus be responsible for the unusual Fermi surface topology revealed by recent quantum-oscillation experiments.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.017001
DOI:
10.1103/PhysRevLett.103.017001
PACS:
74.25.Ha, 71.18.+y, 74.72.Bk, 78.70.Nx

*V.Hinkov@fkf.mpg.de

 
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