Multiple Spin Density Wave State and Symmetry in fcc Antiferromagnets

摘要: Relative stabilities among various multiple spin density wave (MSDW) states specified by equivalent vectors are discussed on the basis of symmetry considerations for first-, second- and third-kind antiferromagnetic structures in fcc lattice. The energy MSDW state is expressed as expansion with respect to normalized amplitudes constituent single- Q states. degeneracy states, which not lifted Heisenberg model, shown be removed more than or equal fourth-order perturbation transfer integrals between atoms. Within lowest order expression remove degeneracy, possible stable discussed. effect higher perturbations prospect determine most transition metals first-kind ordering also