Cerium-doping and oxygen-reduction effects on magnons and phonons in Nd sub 2 minus x Ce sub x CuO sub 4 minus y

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.44.809· OSTI ID:5689572

Sugai, S ^[1]; Hidaka, Y ^[2]

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1. Department of Physics, Faculty of Science, Osaka University, 1-1 Machikaneyama, Toyonaka 560, Japan (JP)
2. NTT Applied Electronics Laboratories, 162 Tokai, Ibaraki 319-11, Japan (JP)

Cerium-substitution and oxygen-reduction effects on magnons in Nd{sub 2{minus}{ital x}}Ce{sub {ital x}}CuO{sub 4{minus}{ital y}} were investigated by Raman scattering. Even with increasing Ce concentration, the local antiferromagnetic order does not decrease and, moreover, the average energy of the magnon peak increases, in contrast to hole-type superconductors. This quite different behavior between electron- and hole-type superconductors may suggest that the spins do not directly contribute to the superconductive mechanism. Only near {ital x}=0.15 is there almost no oxygen deficiency on the CuO{sub 2} layers. It indicates that the defects on the layers disturb the superconductivity.

• OSTI ID: 5689572
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 44:2; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
AMINES
AMMONIUM COMPOUNDS
ANTIFERROMAGNETISM
CERIUM ADDITIONS
CERIUM ALLOYS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
CRYSTALS
ELEMENTS
HIGH-TC SUPERCONDUCTORS
HOLES
MAGNETISM
MAGNONS
MONOCRYSTALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHONONS
PHYSICAL PROPERTIES
POINT DEFECTS
QUASI PARTICLES
QUATERNARY COMPOUNDS
RAMAN SPECTRA
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
RARE EARTH COMPOUNDS
REDUCTION
SPECTRA
STOICHIOMETRY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
VACANCIES
VERY LOW TEMPERATURE