QUANTUM-WELL STATES IN HIGH-QUALITY CU FILMS DEPOSITED ON CO(100) - AHIGH-RESOLUTION PHOTOEMISSION-STUDY

Quantum well (QW) states of thin Cu films deposited on Co (100) are st udied using high resolution photoemission. In order to obtain a smooth Co-Cu interface, Cu films were prepared by evaporating the interfacia l layer at 100 K. This allows us to obtain better defined QW features at the valence band. Furthermore, following this preparation method we are able to observe for the first time QW states at the neck of the C u Fermi surface, which are not observable when the interfacial layer i s deposited at 300 K. Using these high-quality films we also study; fi nal-state-related oscillations in the intensity of the photoemission s pectra as well as the lifetime broadening of the QW states. (C) 1998 A merican Vacuum Society. [S0734-2101(98)04203-1].