Antiferromagnetism in YBa/sub 2/Cu/sub 3/O/sub 6+x/
Conference
·
OSTI ID:7192573
A number of models for high temperature superconductivity in the layered cuprate perovskites require strong antiferromagnetic superexchange interactions between Cu atoms. The existence of such interactions in La/sub 2/CuO/sub 4-y/ has previously been demonstrated. In this paper a review is given of recent neutron scattering work performed at Brookhaven studying antiferromagnetism in RBa/sub 2/Cu/sub 3/O/sub 6+x/ with R = Y, Nd. Measurements on ceramic samples with a range of oxygen concentrations have shown that 3D antiferromagnetic ordering of the Cu spins occurs throughout the nonsuperconducting tetragonal phase, corresponding to O less than or equal to x /approx lt/ 0.4. Near x /approximately/ O the Cu/sup 2 +/ atoms in the CuO/sub 2/ layers form a simple Neel lattice, and there is no ordering of the nonmagnetic Cu/sup 1 +/ atoms in the ''chain'' sites. With increasing oxygen content some of the Cu/sup 1 +/ atoms are converted to Cu/sup 2 +/, which leads to frustration of the interplanar coupling and eventually to a second type of ordering. Very recently, large single crystals of YBa/sub 2/Cu/sub 3/O/sub 6+x/ have been grown, making possible inelastic scattering studies of magnetic excitations. Spin waves within the CuO/sub 2/ planes are observed to have a velocity /approx gt/ 0.5 eV /angstrom/. 26 refs., 6 figs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7192573
- Report Number(s):
- BNL-41521; CONF-880703-6; ON: DE88015854
- Country of Publication:
- United States
- Language:
- English
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Neutron-diffraction determination of antiferromagnetic structure of Cu ions in YBa/sub 2/Cu/sub 3/O/sub 6+//sub x/ with x = 0. 0 and 0. 15
Journal Article
·
Mon Nov 14 23:00:00 EST 1988
· J. Appl. Phys.; (United States)
·
OSTI ID:6743786
Antiferromagnetism in YBa/sub 2/Cu/sub 3/O/sub 6+//sub x/
Journal Article
·
Mon Aug 01 00:00:00 EDT 1988
· Phys. Rev. B: Condens. Matter; (United States)
·
OSTI ID:7145244
Neutron-diffraction determination of antiferromagnetic structure of Cu ions in YBa/sub 2/Cu/sub 3/O/sub 6+//sub x/ with x = 0. 0 and 0. 15
Journal Article
·
Sun Jan 10 23:00:00 EST 1988
· Phys. Rev. Lett.; (United States)
·
OSTI ID:5619685
Related Subjects
36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETIC MOMENTS
MAGNETISM
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
MAGNETIC MOMENTS
MAGNETISM
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES