Abstract
Magnetic and Mössbauer measurements have been made on the intermetallic compound Tm2 Al from 1.4 to 300 K. The susceptibility data show Curie—Weiss behaviour with an effective magnetic moment of 7.7(1) μB per atom, cf. the free ion value of 7.56 μB. No evidence of magnetic ordering is found down to 1.4 K. By way of contrast, however, the169Tm Mössbauer data at 1.4 K reveal two fully split six-line spectra, with differing magnetic and quadrupole hyperfine parameters. By 4.2 K, the weaker of the two sub-spectrum has collapsed to form a peak in the centre of the Mössbauer spectrum. At higher temperatures the intensity of the split sub-spectrum slowly disappears, while retaining a virtually temperature-independent magnetic splitting. Both the Tm sites in Tm2Al therefore exhibit typical para-magnetic relaxation behaviour, with little or no cross-talk between the two Tm species. As with both TmAl and Tm3Al2, Tm2Al exhibits unusually long relaxation times for a metallic material.
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Bowden, G.J., Cadogan, J.M., Day, R.K. et al. 169Tm Mössbauer experiments in the paramagnetic phase of Tm2 Al. Hyperfine Interact 39, 359–367 (1988). https://doi.org/10.1007/BF02397645
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DOI: https://doi.org/10.1007/BF02397645