2-DIMENSIONAL DIFFRACTION PATTERNS OF ERFE2O4-DELTA

Diffraction patterns in the (h h l) plane of ErFe2O4-delta, measured a s a function of temperature, show the two-dimensional spin (ferrimagne tic)-charge ordering of Fe2+ and Fe3+ with weak correlations between t he planes. A model recently proposed for this spin-charge ordering has been examined by measurements of the intensity for three different cr ystal directions in the c-plane, since the model leads to the existenc e of three kinds of domain with quite different volumes. In contrast t o this expectation, the results show no appreciable intensity differen ces.