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Magnetic phases of the mixed-spin J(1)-J(2) Heisenberg model on a square lattice

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Ivanov,  Nedko Borissov
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Ivanov, N. B., Richter, J., & Farnell, D. (2002). Magnetic phases of the mixed-spin J(1)-J(2) Heisenberg model on a square lattice. Physical Review B, 66(1): 014421. doi:10.1103/PhysRevB.66.014421.


Cite as: http://hdl.handle.net/21.11116/0000-0003-2A50-4
Abstract
We study the zero-temperature phase diagram and the low-energy excitations of a mixed-spin (S-1>S-2) J(1)-J(2) Heisenberg model defined on a square lattice by using a spin-wave analysis, the coupled cluster method, and the Lanczos exact-diagonalization technique. As a function of the frustration parameter J(2)/J(1) (>0), the phase diagram exhibits a quantized ferrimagnetic phase, a canted spin phase, and a mixed-spin collinear phase. The presented results point towards a strong disordering effect of the frustration and quantum spin fluctuations in the vicinity of the classical spin-flop transition. In the extreme quantum system (S-1, S-2)=(1, 1/2), we find indications of a different quantum spin state in the region 0.46<J(2)/J(1)<0.5.