Physics – Condensed Matter – Superconductivity
Scientific paper
2008-12-02
Phys. Rev. Lett. 103, 157003 (2009)
Physics
Condensed Matter
Superconductivity
Scientific paper
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 YBa$_{2}$Cu$_{3}$O$_{6.5}$. 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 \emph{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 {\it et al}., Nature {\bf 454}, 200 (2008)].
Audouard Alain
Bonn Douglas A.
Hardy Walter N.
Jaudet Cyril
Liang Ruixing
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