  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.
