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The magnetic correlations in the quasi-two dimensional spin-1/2square-lattice system Zn2VO(PO4)2 have been investigated by neutron diffractiontechnique. A long-range antiferromagnetic (AFM) ordering below 3.75 K (TN) hasbeen observed with a reduced moment of 0.66(2) {\mu}B per V ion at 1.5 K. In agiven ab plane, the AFM spin arrangement is N\'eel type and the AFM layers arecoupled ferromagnetically along the c axis. Remarkably, we have observed a pure2D short-range AFM ordering in the ab plane above TN. Interestingly, thecoexistence of diffuse magnetic scattering and three dimensionalantiferromagnetic Bragg peaks has been found below TN, indicating the presenceof spin-waves as confirmed by our calculation using the linear spin-wavetheory. The observed results are discussed in the light of existing theory fora two-dimensional spin-1/2 square-lattice system.

Two- and three-dimensional magnetic correlations in the spin-1/2 square-lattice system Zn2VO(PO4)2