V. Cannella and J. A. Mydosh measured low-field magnetic susceptibility of gold-iron alloys using a mutual inductance bridge. Moving samples into and out of the pickup arrangement separated their signal from the background. Cooling revealed sharp susceptibility cusps; changing concentration, sample shape and applied magnetic field tested their interpretation. Larger fields rounded the peaks. Their 1972 paper interpreted low-concentration ordering in antiferromagnetic terms: the cusp alone did not demonstrate Parisi's later theory.[ref]
Magnetic Ordering in Gold-Iron Alloys by Vincent Cannella and John A. Mydosh. §III, p. 4224, mutual-inductance method; §V, pp. 4228–4230, figures 9–12 and field/shape comparisons; abstract for the authors' contemporary interpretation
This experiment measures a response to a small applied perturbation, rather than directly photographing frozen spins. Comparing field strengths is essential because the probing magnetic field itself changes the response.[ref]
Magnetic Ordering in Gold-Iron Alloys by Vincent Cannella and John A. Mydosh. §V.A, pp. 4229–4230, weak-field cusp rounding
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