Antiferromagnetism in YBa/sub 2/Cu/sub 3/O/sub 6+//sub x/ (invited)

Journal Article · Tue Nov 15 04:00:00 EST 1988 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.342125· OSTI ID:6743786

Tranquada, J M

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-//sub y/ has previously been demonstrated. In this paper a review is given of recent neutron scattering work performed at Brookhaven studying antiferromagnetism in RBaCu/sub 3/O/sub 6+//sub x/ with R = Y, Nd. Measurements on ceramic samples with a range of oxygen concentrations have shown that three-dimensional antiferromagnetic ordering of the Cu spins occurs throughout the nonsuperconducting tetragonal phase, corresponding to 0less than or equal toxapprox. <0.4. Near xapprox.0 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+//sub 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. >0.5 eV A.

• Research Organization: Physics Department, Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 6743786
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 64:10; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
&amp; Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIFERROMAGNETISM
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HIGH TEMPERATURE
LOW TEMPERATURE
MAGNETIC PROPERTIES
MAGNETISM
MEDIUM TEMPERATURE
MONOCRYSTALS
NEEL TEMPERATURE
NEUTRON DIFFRACTION
OXIDES
OXYGEN COMPOUNDS
PEROVSKITES
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWDERS
QUANTITY RATIO
SCATTERING
SPIN WAVES
SUPERCONDUCTIVITY
SUPERCONDUCTORS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
TYPE-II SUPERCONDUCTORS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES