Abstract
Positron-annihilation two-dimensional angular correlation measurements (2D ACAR) have been performed on a YBa 2Cu 3O 7−x single crystal with T c = 93.6 K. Projections both parallel and perpendicular to the c-axis were obtained. On the basis of these experiments, we propose that the Fermi surface consists of four nearly cylindrical sheets, in substantial accord with band theory predictions. These are first Fermi surfaces measured directly via c-axis projection in a high- T c superconductor.
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