Determination of the exchange energies inLi2VOSiO4from a high-temperature series analysis of the square-latticeJ1−J2Heisenberg model

2003/02/27 by Grégoire Misguich, G. Misguich, B. Bernu +1 · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Physics of Superconductivity and Magnetism #Theoretical and Computational Physics #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.68.113409

published as Phys. Rev. B 68, 113409 (2003) · 4 pages, 5 figs (.eps), RevTex4. Submitted to Phys. Rev. B

arxiv created 2003/02/27 · openalex publication_date 2003/09/24 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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\ensuremath-J₂ Heisenberg model on the square lattice with exchange energies J₁=1.25\ifmmode±\else\textpm\fi0.5K and J₂=5.95\ifmmode±\else\textpm\fi0.2K. The maximum of the specific heat C_v^max(T_max) is obtained as a function of J₂/J₁ from an improved method based on HTE.

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• Moments of general Heisenberg Hamiltonians up to sixth order
• Finite temperature properties and frustrated ferromagnetism in a square lattice Heisenberg model

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