Magnetic and thermodynamic properties ofLi2VOSiO4:A two-dimensionalS=1/2frustrated antiferromagnet on a square lattice
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Abstract
NMR, muon spin rotation $(\ensuremath{\mu}\mathrm{SR}),$ magnetization, and specific-heat measurements in ${\mathrm{Li}}_{2}{\mathrm{VOSiO}}_{4}$ powders and single crystals are reported. Specific-heat and magnetization measurements evidence that ${\mathrm{Li}}_{2}{\mathrm{VOSiO}}_{4}$ 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 ${(J}_{2}{/J}_{1}=1.1\ifmmode\pm\else\textpm\fi{}0.1$ with ${J}_{2}{+J}_{1}=8.2\ifmmode\pm\else\textpm\fi{}1 \mathrm{K}).$ At ${T}_{c}\ensuremath{\simeq}2.8 \mathrm{K}$ a phase transition to a low-temperature collinear order is observed. ${T}_{c}$ and the sublattice magnetization, derived from NMR and $\ensuremath{\mu}\mathrm{SR},$ were found practically independent on the magnetic field intensity up to 9 T. The critical exponent of the sublattice magnetization was estimated \ensuremath{\beta}\ensuremath{\simeq}0.235, nearly coincident with the one predicted for a two-dimensional $\mathrm{XY}$ 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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