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We present a high-temperature expansion (HTE) of the magnetic susceptibilityand specific heat data of Melzi et al. on Li2VOSiO4 [Phys. Rev. B 64, 024409(2001)]. The data are very well reproduced by the J1-J2 Heisenberg model on thesquare lattice with exchange energies J1=1.25+-0.5 K and J2=5.95+-0.2 K. Themaximum of the specific heat Cv^{max}(T_{max}) is obtained as a function J2/J1from an improved method based on HTE.Comment: 4 pages, 5 figs (.eps), RevTex4. Submitted to Phys. Rev.

physical review. b, condensed matter

Determination of the exchange energies in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Li</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">VOSiO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>from a high-temperature series analysis of the square-lattice<mml:math xmlns:mml="http…

Determination of the exchange energies inLi2VOSiO4from a high-temperature series analysis of the square-lattice