Magnetic and electronic correlations in YBa sub 2 Cu sub 3 O sub 6+x

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:5293193

Tranquada, J M

YBa{sub 2}Cu{sub 3}O{sub 6+x} is an antiferromagnetic insulator in its tetragonal phase at small x, and it becomes a superconducting metal in the large x orthorhombic phase. The transition between the two phases is controlled by the orientational ordering of CuO{sub x} chain segments and dielectric screening by the BaO layers. In the orthorhombic phase, holes from the chains are transferred to the CuO{sub 2} planes, and the superconducting transition temperature scales with the density of O 2p holes. The antiferromagnetic ordering in the tetragonal phase is dominated by localized Cu moments in the CuO{sub 2} planes. The two-dimensional (2D) coupling between those spins is unusually strong. The interaction between nearest-neighbor planes is sufficiently strong that spins in bilayers remain highly correlated well above the Neel temperature. Long-range order is destroyed when a significant density of O 2p holes is present in the planes; however, there is evidence that Cu moments survive and interact in the metallic phase. 55 refs., 13 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE/ER; USJPCNS
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5293193
• Report Number(s): BNL-43107; CONF-8907139--3; ON: DE89017604
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORRELATIONS
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON CORRELATION
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HAMILTONIANS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTUM OPERATORS
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS