Abstract
The lattice parameters a, b and c of TmCu2, GdCu2 and YCu2 have been measured in the temperature range from 4.2 K up to 300 K using X-ray powder diffraction. The influence of the crystal field on the thermal expansion in TmCu2 in the paramagnetic region (TmCu2 orders magnetically at TN = 6.3 K) has been determined by comparing the thermal expansion of the nonmagnetic YCu2 with that of TmCu2 . The data thus obtained are compared with a theoretical model given in Gratz et. al. 1993 using a set of crystal field parameters published by Gabbiness et al. 1992. GdCu2, for which the influence of the crystal field can be neglected (Gd3+ : L = 0), has also been investigated in order to study the influence of the exchange interaction below the magnetic ordering temperature of 42K.
| Original language | English |
|---|---|
| Pages (from-to) | 467-472 |
| Number of pages | 6 |
| Journal | Materials Science Forum |
| Volume | 166-169 |
| Issue number | pt 2 |
| Publication status | Published - 1994 |
| Externally published | Yes |
| Event | Proceedings of the 3rd European Powder Diffraction Conference. Part 2 (of 2) - Vienna, Austria Duration: 25 Sept 1993 → 28 Sept 1993 |