Magnetic resonance, nuclear orientation and antiferromagnetism

A small range of compounds contain ions from two transition groups, 3d and 4f. Most of these enter an ordered antiferromagnetic state only at liquid h elium temperatures, and the internal fields are 1 tesla or less. Experiment s are suggested on various single crystals. Measurements by electron spin r esonance on impurity ions in antiferromagnetic dysprosium phosphate show th at similar compounds could be used for experiments on nuclear orientation w ith nuclear magnetic resonance.