The spinel solid solutions ZnCr,,Al, -,,S4 are studied by neutron diffraction experiments. They show a helimagnetic phase in the concentration range 0.85 5 x 5 1. The helix angle decreases as x is decreased. The three first exchange integrals and their evolution with x are obtained. The disappearance of the long-range order is shown to be due to the large decrease of the ferromagnetic in-plane interaction. The results are extended to obtain the fourth exchange integral.
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