Abstract
We investigated several AuIn2 samples of similar purity by spin-echo techniques. The temperatures and fields ranged from 0.5 to 20 mK and from 0.06 to 0.8 T, respectively. Our results are: The Knight-shift changed from sample to sample within about 5%. Spin-echoes could not be found in all samples. T2 ranged from about 40 μs in one sample, to a temperature and field independent T2 = 83 μs for another sample, to a field and temperature dependent T2 which varied for this sample from 2 ms at low B/Tn-values (∼5 T/K) to 0.3 ms at B/Tn ∼300. We have shown that the temperature of the conduction electron system is the relevant temperature in the problem, and not the nuclear spin-temperature of In. From the amplitudes of multiple spin-echo structures we conclude that demagnetizing fields are not the only origin for their occurrence.
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