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In the pyrochlore antiferromagnets, the magnetic ions are situated at the vertices of a framework of cornersharing tetrahedra. The result is intense geometrical frustration of the magnetic interactions. We present the results of a single-crystal neutron-diffraction study of the pyrochlore CsNiCrF 6 to investigate the development of magnetic order at low temperatures. We find that even at a temperature of 2 K ͑which is below the apparent spin-glass transition͒, the order does not extend further than two nearest neighbors, in spite of the strong antiferromagnetic interactions between spins. We also present the results of Monte Carlo calculations of the magnetic scattering utilizing a simple model Hamiltonian, and find good qualitative agreement with the experimental data. ͓S0163-1829͑97͒02637-4͔

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