Magnetic phases of the mixed-spin $J_1-J_2$ Heisenberg model on a square lattice

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 new quantum spin state in the region $0.46<J_2/J_1<0.5$

5 PRB pages, 7 figures

References in corpus (1)

• Resonating Valence Bond Wave Functions for Strongly Frustrated Spin Systems

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