TWO-PARTICLE CLUSTER THEORY OF ANTIFERROMAGNETISM,

Abstract

The two-spin cluster theory of Strieb, Callen and Horwitz, is extended to antiferromagnets. The theory is formulated to include nearest and next-nearest neighbor exchange (J sub 1 and J sub 2) and to apply to those types of antiferromagnetic Neel phases in which equal numbers of spins are nominally 'up' and 'down'. When J sub 2 = 0 the theory reduces to the antiferromagnetic constant coupling theory of Kasteleijn and van Kranendonk. Consequently the theory suffers from the defect of an anti-Neel transition at low temperatures. (Author)

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1965
Accession Number
AD0612472

Entities

People

  • Earl Callen
  • Herbert B. Callen Nn

Organizations

  • University of Pennsylvania

Tags

DTIC Thesaurus Topics

  • Antiferromagnetism
  • Cooperation
  • Couplings
  • Low Temperature
  • Magnetic Properties
  • Magnetic Transition Temperatures
  • Munitions
  • Neel Temperature
  • Particles
  • Physical Properties
  • Transitions

Fields of Study

  • Physics

Readers

  • Control Systems Engineering.
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.