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Dresden 2009 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Cuprate High-Temperature Superconductors 2

TT 30.1: Talk

Wednesday, March 25, 2009, 14:00–14:15, HSZ 304

Enhancement of the incommensurate magnetic order by an applied magnetic field in underdoped YBa2Cu3O6.45 — •Daniel Haug1, Vladimir Hinkov1, Anton Suchaneck1, Dmytro Inosov1, Niels Christensen2, Christof Niedermayer2, Philippe Bourges3, Yvan Sidis3, Ji Tae Park1, Alexandre Ivanov4, Chengtian Lin1, Joël Mesot2, and Bernhard Keimer11Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — 2Paul-Scherrer-Institut, Villigen, Switzerland — 3Laboratoire Léon Brillouin, CEA-CNRS Saclay, France — 4Institut Laue-Langevin, Grenoble, France

The discovery of quantum oscillations in the high-temperature superconductor YBa2Cu3O6.5 above its critical magnetic field showed that the concepts of Fermi liquid theory are applicable to the strongly correlated electron system in the underdoped cuprates. However, the observation of small electron pockets in these experiments puts a new question as such pockets are incompatible with band structure calculations and the Fermi surface topology found in angle-resolved photoemission at zero magnetic field. Our recent neutron scattering experiments on YBa2Cu3O6.45 reveal an enhancement of the static incommensurate magnetic signal at low temperatures when applying an external magnetic field. This field-enhanced magnetic order may lead to a Fermi surface reconstruction and thus provide a natural explanation for the unexpected Fermi surface topology observed in the quantum oscillation experiments at high magnetic fields.

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