Magnetic phases of the mixed-spin J1-J2 Heisenberg model on a square lattice

Ivanov, N. B.; Richter, J.; Farnell, D. J. J.

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Magnetic phases of the mixed-spin J₁-J₂ Heisenberg model on a square lattice

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Ivanov, N. B.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Richter, J.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Ivanov, N. B., Richter, J., & Farnell, D. J. J. (2002). Magnetic phases of the mixed-spin J₁-J₂ Heisenberg model on a square lattice. Physical Review B, 66(1): 014421. Retrieved from http://ojps.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRBMDO000066000001014421000001&idtype=cvips&gifs=yes.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-3741-C

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.