Angle-resolved photoemission from epitaxialYBa2Cu3O7−x(001)films

Angle-resolved photoemission from epitaxially grown $\mathrm{Y}{\mathrm{Ba}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{7-x}\mathrm{}\left(001\right)\mathrm{}$ single-crystal thin films reveals a clear Fermi edge and fine structure near the edge. Some of the valence-band photoemission features show $k$-space dispersion. These new results suggest that the electronic structure of this oxide can be treated within the framework of the one-electron band picture.