High-energy spin excitations in the insulating phases of high- Tc superconducting cuprates and La sub 2 NiO sub 4 (JP)

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

DOI:https://doi.org/10.1103/PhysRevB.42.1045· OSTI ID:6493108

Sugai, S ^[1]; Sato, M ^[2]; Kobayashi, T; Akimitsu, J ^[3]; Ito, T; Takagi, H; Uchida, S ^[4]; Hosoya, S; Kajitani, T; Fukuda, T ^[5]

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1. Department of Physics, Faculty of Science, Osaka University, Machikaneyama, Toyonaka 560 (Japan)
2. Institute for Molecular Science, Myodaiji, Okazaki 444 (Japan)
3. Department of Physics, Aoyama-Gakuin University, Chitosedai, Setagaya, Tokyo 157 (Japan)
4. Engineering Research Institute, Faculty of Engineering, University of Tokyo, Bunkyo-Ku, Tokyo 113 (Japan)
5. Institute for Materials Research, Tohoku University, Katahira, Sendai 980 (Japan)

High-energy spin excitations up to above 8000 cm{sup {minus}1} were measured by polarized Raman scattering in the insulating phases of {ital S}=1/2 copper oxides, La{sub 2}CuO{sub 4}, YBa{sub 2}Cu{sub 3}O{sub 6.2}, Bi{sub 2}Sr{sub 2}Ca{sub 0.5}Y{sub 0.5}Cu{sub 2}O{sub 8+{ital y}}, Nd{sub 2}CuO{sub 4}, and Pr{sub 2}CuO{sub 4}, and an {ital S}=1 nickel oxide La{sub 2}NiO{sub 4}. All the copper oxides commonly show anomalous spectra, especially the secondary scattering peaks near 4{ital J} ({ital J} is the two-spin superexchange energy). Those anomalies are caused by the large four-spin cyclic exchange interactions. The present experiments demonstrated that the four-spin exchanges show distinctive characteristics in cuprates as compared to other materials.

• OSTI ID: 6493108
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:1; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTALS
CUPRATES
EXCHANGE INTERACTIONS
HIGH-TC SUPERCONDUCTORS
INTERACTIONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MONOCRYSTALS
NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
POLARIZATION
RAMAN SPECTRA
RARE EARTH COMPOUNDS
SPECTRA
SPIN WAVES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY LOW TEMPERATURE