Magnetic pairing in two-dimensional antiferromagnetic XY model

Journal Article · Sun Jan 01 04:00:00 EST 1989 · Int. J. Mod. Phys. B; (United States)

DOI:https://doi.org/10.1142/S021797928900004X· OSTI ID:5828384

Szeto, K Y

A two-dimensional Ising Coulumb gas is introduced to describe the frustrated plaquettes of the two-dimensional antiferromagnetic XY model with Coulumb repulsion. The Ising spin variable corresponds to the two possible chiralities of the frustrated plaquettes, which repel each other with a screened Coulumb potential. Using the self-consistent screening analysis, the Ising Coulumb gas is shown to have a Kosterlitz-Thouless transition from a pairing phase at low temperature to a plasma phase at high temperature. The phase diagram is obtained numerically as a function of density and relative strength of the attraction between particles of opposite chiralities and the Coulumb repulsion. Possible applications to the magnetic mechanism of high temperature superconductors is discussed in the context of Li doped La/sub 2/CuO/sub 4/. It is also argued that the Aharony model of magnetic pairing with the dipolar attraction can be derived as a special case of the Ising Coulomb gas model and is superceded by a stronger attractive interaction in magnetic pairing mechanism in the self-consistent analysis.

• Research Organization: York Univ., Toronto, ON (Canada). Dept. of Physics
• OSTI ID: 5828384
• Journal Information: Int. J. Mod. Phys. B; (United States), Journal Name: Int. J. Mod. Phys. B; (United States) Vol. 3:1; ISSN IJPBE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656001 -- Condensed Matter Physics-- Solid-State Plasma
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
BASIC INTERACTIONS
CALCULATION METHODS
CHALCOGENIDES
CHIRALITY
COOPER PAIRS
COPPER COMPOUNDS
COPPER OXIDES
COULOMB SCATTERING
CRYSTAL MODELS
DIAGRAMS
ELASTIC SCATTERING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC INTERACTIONS
HIGH TEMPERATURE
INTERACTIONS
ISING MODEL
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LOW TEMPERATURE
MAGNETISM
MATHEMATICAL MODELS
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PARTICLES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
PLASMA
RARE EARTH COMPOUNDS
SCATTERING
SOLID-STATE PLASMA
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
TWO-DIMENSIONAL CALCULATIONS