Abstract
Small-angle neutron scattering measurements have been carried out on a ferromagnetic La 0.75Sr 0.25MnO 3 single crystal. In the paramagnetic state, the observed variation of the neutron intensity above q = 0.1 A ̊ -1 indicates the presence of nanometre size scattering objects. This in turn indicates the existence of magnetic coherence above T C, a situation comparable to that encountered in Fe and Ni. A model involving a new expression for the spin correlation function has been developed, which gives very good fit to the data. This is however not consistent with the presence of spin polarons in the paramagnetic state of LaSrMnO ferromagnetic manganites.
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