Abstract
The shape of the Fermi surface of the Sr 2RuO 4, the first noncuprate superconductor, has been directly observed by two-dimensional angle resolved photoelectron spectroscopy (2D-ARPES) technique using a display-type hemispherical mirror analyzer. The gross shape of the Fermi surface agrees with previous band calculations. The photoelectron angular distribution pattern of the Fermi level shows that the Fermi surface is composed of orbitals with d xy, d yz , and d zx -like symmetries which agree well with those predicted by previous band calculations and are in contrast to d x 2− y 2 symmetry of thehigh- T C superconductors.
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