Crystallographic Two Sublattice System —Staggered Susceptibility and Induced Staggered Magnetization in Paramagnetic State—

Abstract

Magnetic basic properties of the crystallographic two sublattice (C₂) system in which magnetic ions at these lattice points have inequivalent g-tensors, are rigorously studied on the basis of the linear response theory. Such a C₂ system under a uniform field is quite equivalent to a fictitious single lattice (C₁) system under both a uniform and a staggered fields. So in such a C₂ system, the staggered magnetization as well as the uniform magnetization is induced in the paramagnetic state by applying a uniform field. On these facts, a possibility to derive the staggered susceptibility from the experimentally observed uniform and staggered magnetizations was examined based on the symmetry of zero field Hamiltonian of the system. Application of the result to the existing one and two dimensional Heisenberg antiferromagnets is discussed with some promising examples.