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Motivated by recent experiments on low-dimensional frustrated quantum magnetswith competing nearest-neighbor exchange coupling J1 and next nearest-neighborexchange coupling J2 we investigate the magnetic susceptibility oftwo-dimensional J1-J2 Heisenberg models with arbitrary spin quantum number s.We use exact diagonalization and high-temperature expansion up to order 10 toanalyze the influence of the frustration strength J2/J1 and the spin quantumnumber 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/J1by comparing with susceptibility measurements on corresponding magneticcompounds.

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