Two-Dimensional Heisenberg Antiferromagnet with Extra-Spin-Induced Frustration

概要

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A square lattice Heisenberg antiferromagnet with extra-spin-induced frustration isstudied by means of spin wave theory. The extra spins are inserted between every twoadjacent host spins on the square lattice. The interactioua between host spins and extraspins causes the system to be frustrated. We find that for a wide range of frustrationparameter the classical ground state is heavily degenerate and an ordered state is nolonger stable, regardless of the magnitude of spins. This fact suggests the existence ofspin-liquid ground state in the range. We also find that the N<:el order of square latticeantiferromagnet can be destroyed with only a little frustration introduced in thismodel.[square lattice antiferromagnet, frustration, spin liquid, degeneracy, spin wave l] theoryl
社団法人日本物理学会の論文
1991-03-15