Phys. Rev. B 68, 113409 (2003) [4 pages]Determination of the exchange energies in Li2VOSiO4 from a high-temperature series analysis of the square-lattice J1-J2 Heisenberg modelReceived 27 February 2003; published 24 September 2003 We present a high-temperature expansion (HTE) of the magnetic susceptibility and 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 the square lattice with exchange energies J1=1.25±0.5K and J2=5.95±0.2K. The maximum of the specific heat Cvmax(Tmax) is obtained as a function of J2/J1 from an improved method based on HTE. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.113409
DOI:
10.1103/PhysRevB.68.113409
PACS:
75.10.Jm, 75.50.Ee
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