Resonant-photoemission study of Nd sub 2 minus x Ce sub x CuO sub 4

Journal Article · Sun Apr 01 04:00:00 EDT 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.7205· OSTI ID:7122724

Namatame, H; Fujimori, A; Tokura, Y ^[1]; Nakamura, M; Yamaguchi, K; Misu, A ^[2]; Matsubara, H; Suga, S ^[3]; Eisaki, H; Ito, T; Takagi, H; Uchida, S ^[4]

---

1. Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan (JP)
2. Department of Physics, Science University of Tokyo, Kagurazaka, Shinjuku-ku, Tokyo 162, Japan (JP)
3. Synchrotron Radiation Laboratory, Institute for Solid State Physics, University of Tokyo, Tanashi, Tokyo 188, Japan (JP)
4. Engineering Research Institute, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan (JP)

We have studied the photoemission spectra of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4} (0.05{le}{ital x}{le}0.2) using synchrotron radiation in the Cu 3{ital p}{r arrow}3{ital d}, Nd 4{ital d}{r arrow}4{ital f}, and Ce 4{ital d}{r arrow}4{ital f} core absorption regions. The valence-band satellite corresponding to Cu{sup 2+} shows a resonance behavior. The Nd 4{ital f}--derived photoemission spectrum shows a double-peak structure, which is characteristic of the localized 4{ital f}{sup 3} ground state and strong 4{ital f}--O 2p hybridization. The Ce 4{ital f}--derived photoemission is distributed predominantly near the top of the O 2{ital p} band. Comparing the results with those of La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}, we find that the Fermi level is located only {approx}0.7 eV above the top of the valence band in spite of the large (1.5--eV) band gap of Nd{sub 2}CuO{sub 4}, indicating that the Fermi level of Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4} lies within the band gap of Nd{sub 2}CuO{sub 4}.

• OSTI ID: 7122724
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:10; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BREMSSTRAHLUNG
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
EMISSION
ENERGY LEVELS
ENERGY SPECTRA
FERMI LEVEL
HYBRIDIZATION
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
RADIATIONS
RARE EARTH COMPOUNDS
SECONDARY EMISSION
SPECTRA
SUPERCONDUCTORS
SYNCHROTRON RADIATION
TRANSITION ELEMENT COMPOUNDS