Abstract
The Fermi surface of the noncuprate superconductor Sr 2 RuO 4 has been studied in detail by two-dimensional angle resolved photoelectron spectroscopy (2D-ARPES) using a display-type electron spectrometer and a linearly polarized synchrotron radiation. The existence of the large Fermi surfaces agrees with previous band calculations and conventional ARPES measurements. From the comparison of the observed photoelectron intensity distribution of the Fermi surface with that of the simulation for atomic orbitals, the symmetry of the atomic orbitals composing the Fermi surfaces is revealed to be the d e ; d x y , d y z , d z x -like in contrast to the d x 2 - y 2 -like orbital in the cuprate high- T c super conductor. The possibility of the existence of the extended van-Hove singularity just below the Fermi level, which was suggested by recent conventional ARPES measurements, is also discussed.
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