Variational calculation for the spin-(1/2 Heisenberg antiferromagnet on a square lattice

Journal Article · Sun Jan 01 00:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.386· OSTI ID:6386868

Dasgupta, C

The ground-state properties of the spin-(1/2 Heisenberg antiferromagnet on a square lattice are studied by using a simple variational wave function that interpolates continuously between the Neel state and short-range resonating-valence-bond states. Exact calculations of the variational energy for small systems show that the state with the lowest energy has long-range antiferromagnetic order. The staggered magnetization in this state is approximately 70% of its maximum possible value. The variational estimate of the ground-state energy is substantially lower than the value obtained for the nearest-neighbor resonating-valence-bond wave function.

• Research Organization: Department of Physics, Indian Institute of Science, Bangalore 560chemically bond012, India
• OSTI ID: 6386868
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 39:1
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETIC MATERIALS
GROUND STATES
HEISENBERG MODEL
INTERPOLATION
MAGNETIZATION
NEEL TEMPERATURE
RESONANCE
VARIATIONAL METHODS
WAVE FUNCTIONS
CRYSTAL MODELS
ENERGY LEVELS
FUNCTIONS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
NUMERICAL SOLUTION
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
656100* - Condensed Matter Physics- Superconductivity