Magnetic susceptibility of frustrated spin-s J₁-J₂ quantum Heisenberg magnets: High-temperature expansion and exact diagonalization data

Motivated by recent experiments on low-dimensional frustrated quantum magnets with competing nearest-neighbor exchange coupling J₁ and next nearest-neighbor exchange coupling J₂ we investigate the magnetic susceptibility of two-dimensional J₁-J₂ Heisenberg models with arbitrary spin quantum number s. We use exact diagonalization and high- temperature expansion up to order 10 to analyze the influence of the frustration strength J₂/J₁ and the spin quantum number s on the position and the height of the maximum of the susceptibility. The derived theoretical data can be used to get information on the ratio J₂/J₁ by comparing with susceptibility measurements on corresponding magnetic compounds.