FIGURE 4. Fermi surface of YBCO from band structure calculations.

From the following article:

Quantum oscillations and the Fermi surface in an underdoped high-Tc superconductor

Nicolas Doiron-Leyraud, Cyril Proust, David LeBoeuf, Julien Levallois, Jean-Baptiste Bonnemaison, Ruixing Liang, D. A. Bonn, W. N. Hardy & Louis Taillefer

Nature 447, 565-568(31 May 2007)

doi:10.1038/nature05872

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a, Fermi surface of YBa2Cu3O7 in the kz = 0 plane (from ref. 13, with permission from O. K. Andersen), showing the four bands discussed in the main text. b, Fermi surface of ortho-II ordered YBa2Cu3O6.5 in the kz = 0 plane (from ref. 16, with permission from T. M. Rice). In both a and b the grey shading indicates one quadrant of the first Brillouin zone.

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