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Multiple Quantum Oscillations in the de Haas–van Alphen Spectra of the Underdoped High-Temperature Superconductor YBa2Cu3O6.5

Alain Audouard, Cyril Jaudet, David Vignolles, Ruixing Liang, D. A. Bonn, W. N. Hardy, Louis Taillefer, Cyril Proust

DOI 10.1103/PhysRevLett.103.157003 · Physical Review Letters

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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 et al., Nature (London) 454, 200 (2008)].

Source-reported materials — not catalogue approval

FormulaReported Tc (K)Pressure (GPa)Type
YBa2Cu3O6.51

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57.5Pressure not reportedunknown
YBa2Cu3O6.54

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Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.

60Pressure not reportedunknown

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