Photoemission study of electronic structures of disordered Ni-Pt and Cu-Pt alloys

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.7807· OSTI ID:383808

Nahm, T; Kim, J; Oh, S ^[1]; Chung, S ^[2]; Park, J; Allen, J W ^[3]; Jeong, K ^[4]; Kim, S ^[5]

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1. Department of Physics, Seoul National University, Seoul 151-742 (Korea)
2. Department of Physics, Pohang University of Science and Technology, Pohang 790-784 (Korea)
3. Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
4. Department of Physics, Yonsei University, Seoul 120-749 (Korea)
5. Department of Chemistry and Center for Molecular Science, Korea Advanced Institute of Science and Technology, Taejon 373-1 (Korea)

The valence-band photoemission spectra of disordered Ni{sub {ital x}}Pt{sub 1{minus}{ital x}} and Cu{sub {ital x}}Pt{sub 1{minus}{ital x}} alloys have been measured with synchrotron radiation. Using the Cooper minimum phenomenon of the Pt 5{ital d} electron photoionization cross section and taking the matrix-element effect into account, we obtain experimental partial spectral weights (PSW{close_quote}s) of each constituent. For the Ni-rich Ni-Pt alloys, we find substantial weights of the Pt states near the Fermi level, which are believed to be responsible for the Pt local magnetic moment. The comparison with the theoretical calculations in this case shows the importance of both relativistic effect and the self-consistent-field treatment. For the Cu-rich Cu-Pt alloys, we find that due to the strong hybridization Cu 3{ital d} and Pt 5{ital d} states form a common band. This calls into question the conclusion of the early photoemission study that Pt impurity forms a virtual bound state in the Cu host. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383808
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 11 Vol. 54; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BINARY ALLOY SYSTEMS
COPPER ALLOYS
DISORDERED SYSTEMS
ELECTRONIC STRUCTURE
HYBRIDIZATION
NICKEL ALLOYS
PHOTOEMISSION
PLATINUM ALLOYS
SUBSTITUTION
SYNCHROTRON RADIATION
VALENCE BANDS