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

Yusuf, S. M. ; Bera, A. K. ; Kini, N. S. ; Mirebeau, I. ; Petit, S. (2010) Two- and three-dimensional magnetic correlations in the spin-1/2 square-lattice system Zn2VO(PO4)2 Physical Review B, 82 (9). Article ID 094412. ISSN 1098-0121

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Official URL: https://journals.aps.org/prb/abstract/10.1103/Phys...

Related URL: http://dx.doi.org/10.1103/PhysRevB.82.094412

Abstract

The magnetic correlations in the quasi-two-dimensional (2D) spin-1/2 square-lattice system Zn2VO(PO4)2 have been investigated by neutron-diffraction technique. A long-range antiferromagnetic (AFM) ordering below 3.75 K (TN) has been observed with a reduced moment of 0.66(2) μB per V ion at 1.5 K. In a given ab plane, the AFM spin arrangement is Néel type and the AFM layers are coupled ferromagnetically along the c axis. Remarkably, we have observed a pure 2D short-range AFM ordering in the ab plane above TN. Interestingly, the coexistence of diffuse magnetic scattering and three-dimensional antiferromagnetic Bragg peaks has been found below TN, indicating the presence of spin waves as confirmed by our calculation using the linear spin-wave theory. The observed results are discussed in the light of existing theory for a two-dimensional spin-12 square-lattice system.

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