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Magnetic and thermodynamic properties of Li(2)VOSiO(4): a two-dimensional S=1/2 frustrated antiferromagnet on a square lattice

R. Melzi·S. Aldrovandi·F. Tedoldi·P. Carretta·P. Millet·F. Mila
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Abstract

NMR, muSR, magnetization and specific heat measurements in Li(2)VOSiO(4) powders and single crystals are reported. Specific heat and magnetization measurements evidence that Li(2)VOSiO(4) is a frustrated two-dimensional S=1/2 Heisenberg antiferromagnet on a square lattice with a superexchange coupling J_1, along the sides of the square, almost equal to J_2, the one along the diagonal ($J_2/J_1=1.1\pm 0.1$ with $J_2 + J_1 = 8.2\pm 1$ K). At $T_c\simeq 2.8$ K a phase transition to a low temperature collinear order is observed. T_c and the sublattice magnetization, derived from NMR and muSR, were found practically independent on the magnetic field intensity up to 9 Tesla. The critical exponent of the sublattice magnetization was estimated $β\simeq 0.235$, nearly coincident with the one predicted for a two-dimensional XY system on a finite size. The different magnetic properties found above and below T_c are associated with the modifications in the spin hamiltonian arising from a structural distortion occurring just above T_c.

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R. Melzi, S. Aldrovandi, F. Tedoldi, P. Carretta, P. Millet, F. Mila. 2001-01-05. Magnetic and thermodynamic properties of Li(2)VOSiO(4): a two-dimensional S=1/2 frustrated antiferromagnet on a square lattice. https://doi.org/10.1103/physrevb.64.024409

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