Abstract
The results of the first observation of the small-angle polarized neutron scattering (SAPNS) from magnetic flux inhomogeneities in high- T c YBaCuO and LaSrCuO ceramics are reported. The difference between the scattering cross sections for neutrons initially polarized along or opposite to the applied field was found at T < T c and in the range of applied field below H c1 of grain in ceramics. The alternative sign effect was observed in remanent field trapped in grains after applying a field. The effect is explained by nuclear-magnetic interference and is proportional to the Fourier transform of the cross-correlator of the magnetic-nuclear (MN) scattering length density fluctuations (SLD).
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