ANOMALOUS AF-SF LINE BOUNDARY IN THE PHASE-DIAGRAM OF RB2FE1-XINXCL5-CENTER-DOT-H2O SOLID-SOLUTIONS

The boundaries between the antiferromagnetic (AF) and spin-flop (SE) p hases in solid solutions of the low anisotropy antiferromagnets Rb2Fe1 -xInxCl5 . H2O (x = 0.00, 0.10) have been studied by means of neutron diffraction experiments. The experiments show that the presence of In impurities can originate, at the AF-SF region, a coherent gradual rota tion of the Neel vector from the a direction to the c direction accord ing to theoretical predictions.