Phase diagram of an anisotropic J1−J2−J3 model of a spin-12 square-lattice antiferromagnet

Using conventional spin-wave theory, we present the effect of anisotropic spin coupling on the phase diagram based on an anisotropic J1−J2−J3 model. Parameter space is extended from only frustrated J1 and J2 to a more large one including long range spin interactions, both frustrated and unfrustrated. In this extended J2−J3 parameter space the Néel ordered phase is located, and it is found that the Néel ordered area can be expanded by enhancing the anisotropy of in-plane spin interaction.