OneDimensional Chain of Anisotropic SpinSpin Interactions. II. Properties of the GroundState Energy Per Lattice Site for an Infinite System
Abstract
The groundstate energy 2f per lattice site for an infinite system is studied as a function of Δ and of the magnetization y. Analyticity properties of f(Δ, y) are proved. The behavior of f(Δ, y) at and near y=0 and y=1 are investigated.
 Publication:

Physical Review
 Pub Date:
 October 1966
 DOI:
 10.1103/PhysRev.150.327
 Bibcode:
 1966PhRv..150..327Y