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APS

Spin-Peierls transition in an anisotropic 2D antiferromagnetic Heisenberg model

Pinaki Sengupta, Rajiv R. P. Singh

Published Mar 1, 2003• 0 citations
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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 antiferromagnetic S = 1/2 ( J 1 , J 2 ) model and 1D S 1 = 1, S 2 = 1/2 quantum ferrimagnetic model.