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Quantum fluctuation effects on the ordered moments in a two dimensional frustrated ferrimagnet
Kingshuk Majumdar1, Subhendra D Mahanti2
1Department of Physics, Grand Valley State University, Allendale, MI 49401, United States of America.
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 2D antiferromagneticS= 1/2 (J1,J2) model and 1DS1= 1,S2= 1/2 quantum ferrimagnetic model.
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