Partial spectral weights of disordered Cu[sub [ital x]]Pd[sub 1[minus][ital x]] alloys including the photoemission matrix-element effect

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.51.8140· OSTI ID:6495400

Nahm, T; Han, M; Oh, S ^[1]; Park, J; Allen, J W ^[2]; Chung, S ^[3]

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1. Department of Physics, Seoul National University, Seoul 151-742 (Korea, Republic of)
2. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
3. Department of Physics, Pohang University of Science and Technology, Pohang, 790-784 (Korea, Republic of)

The valence-band photoemission spectra of disordered Cu[sub [ital x]]Pd[sub 1[minus][ital x]] alloys are measured with synchrotron radiation in the soft-x-ray regime. Taking advantage of the Cooper-minimum phenomenon of the Pd 4[ital d] photoionization cross section, we obtain Pd and Cu partial spectral weights of Cu[sub [ital x]]Pd[sub 1[minus][ital x]] alloys at various compositions ([ital x]=0.1, 0.25, 0.5, 0.75, 0.9) using the empirically determined ratio of photoionization cross sections. We find that at this photon energy the photoionization matrix element strongly suppresses structures at the high-binding-energy side of the valence-band spectra where coherent potential approximation calculations predicted appreciable bonding states between Cu 3[ital d] and Pd 4[ital d] levels. By taking the spectra at the x-ray photoemission regime where this matrix element effect is less severe, we find that the experimental Pd partial spectral weight is in good agreement with theoretical predictions. The lattice relaxation effect does not seem very important for the suppression of Cu 3[ital d] and Pd 4[ital d] bonding states, at least for concentrated alloys studied here.

• DOE Contract Number: FG02-90ER45416
• OSTI ID: 6495400
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:13; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BREMSSTRAHLUNG
COPPER ALLOYS
D STATES
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY LEVELS
ENERGY-LEVEL DENSITY
IONIZATION
IONIZING RADIATIONS
PALLADIUM ALLOYS
PHOTOEMISSION
PHOTOIONIZATION
PLATINUM METAL ALLOYS
RADIATIONS
SECONDARY EMISSION
SOFT X RADIATION
STOICHIOMETRY
SYNCHROTRON RADIATION
VALENCE
X RADIATION