Quantum fluctuation effects on the ordered Moments in a two dimensional frustrated ferrimagnet

Abstract

We propose a novel two-dimensional (2D)frustrated quantum spin-1/2 anisotropic Heisenberg model with alternating ferromagnetic and antiferromagnetic magnetic chains along one direction and antiferromagnetic interactions along the other. The (mean-field) ground state is ferrimagnetic in certain range of the interaction space. Spin-wave theory analysis of the reduction of ordered moments at inequivalent spin sites and the instability of the spin waves suggest a quantum phase transition which has the characteristics of both the frustrated two-dimensional antiferromagnetic S=1/2 ($J_1,J_2$) model and 1D S${}_1$=1, S${}_2$=1/2 quantum ferrimagnetic model.

9 pages, 6 figures

References in corpus (5)

• Hierarchical mean-field approach to the $J_1$-$J_2$ Heisenberg model on a square lattice
• The spin-1/2 square-lattice J_1-J_2 model: The spin-gap issue
• Second-order quantum corrections for the frustrated, spatially anisotropic, spin-1/2 Heisenberg antiferromagnet on a square lattice
• Coexistence and interaction of spinons and magnons in an antiferromagnet with alternating antiferromagnetic and ferromagnetic quantum spin chains
• Elementary excitations in the ordered phase of spin-1/2 J1-J2 model on square lattice