title: Multiple quantum oscillations in the de Haas-van Alphen spectra of the underdoped high-temperature superconductor YBa2Cu3O6.5.
abstract: By improving the experimental conditions and extensive data accumulation, we have achieved very high precision in the measurements of the de Haas-van Alphen effect in the underdoped high-temperature superconductor YBa2Cu3O6.5. We find that the main oscillation, so far believed to be single frequency, is composed of three closely spaced frequencies. We attribute this to bilayer splitting and warping of a single quasi-2D Fermi surface, indicating that c axis coherence is restored at low temperature in underdoped cuprates. Our results do not support the existence of a larger frequency of the order of 1650 T reported recently in the same compound [S. E. Sebastian, Nature (London) 454, 200 (2008)].
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses (CNRS), Toulouse, France.
authors.forename: Alain
authors.initials: A
authors.lastname: Audouard
authors.forename: Cyril
authors.initials: C
authors.lastname: Jaudet
authors.forename: David
authors.initials: D
authors.lastname: Vignolles
authors.forename: Ruixing
authors.initials: R
authors.lastname: Liang
authors.forename: D A
authors.initials: DA
authors.lastname: Bonn
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy
authors.forename: Louis
authors.initials: L
authors.lastname: Taillefer
authors.forename: Cyril
authors.initials: C
authors.lastname: Proust