WEAK ANTIFERROMAGNETISM IN YFEO3 AND HOFEO3

We have performed neutron diffraction measurements of the weak antifer romagnetic component of the noncollinear spin arrangement of Fe3+ ions in YFeO3 and HoFeO3 by means of the SNIM-2 neutron spectrometer at th e IBR-2 pulsed reactor of JINR, Dubna. Single crystals were used. The ratio of the week antiferromagnetic component A(b) to the basic antife rromagnetic component G(alpha), was found A(b)/G(alpha) = 0.014 for YF eO3 and A(b)/G(alpha), = 0.011 for HoFeO3 within error limits of about 10 %.