PARTIAL DENSITIES OF STATES IN AMORPHOUS-ALLOYS FROM RESONANT PHOTOEMISSION AND COOPER MINIMA

Synchrotron radiation has been used to investigate resonant photoemission in the amorphous metal systems CuxZr100-x, CuxTi100-x and FexZr100-x. Constant initial state spectra reveal resonant enhancement of Zr 4d-like conduction band states near the Fermi level in Cu45Zr55 and 3d-like Ti states in CU33Ti67 at np --> nd photon excitation energies; this is in contrast to the absence of resonance effects in a lower lying "filled" Cu 3d-like band. Observation of a Cooper minimum in the photoemission cross section in Cu45Zr55 gives further support to the importance of Zr 4d states near the Fermi edge. In contrast both conduction band features in Fe90Zr10 show Fe 3p --> 3d resonant enhancement with some evidence of Zr 4p --> 4d resonance. This is consistent with Cu45Zr55 and CU33Ti67 exhibiting split band behaviour, while the d electrons in Fe90Zr10 appear to form a common band.