Abstract
The magnetic neutron scattering from an aluminosilicate glass containing manganese measured in variable magnetic fields and at different temperatures can be described in terms of a shell model in which one reference spin is correlated with the spins of two or three neighbour shells. Spin correlation functions and the mean interatomic distances of the manganese ions are calculated by a fit of the theoretical scattering cross section for magnetically short-ranged ordered systems to the difference spectra between different temperatures. The change of the scattering in high magnetic fields at low temperatures is shown to be due to an incomplete 'spin flop phase transition'.
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