- Jakub Šebesta: Magnetism in the RCo2-type compounds
- 11. 3. 2015, 14:50
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
Magnetism in RECo2 compounds has been subject of studies already in the second half of last century. However, in recent years these materials became interesting again because of new magnetic state - called parimagnetism - discovered few years ago in RECo2 ferrimagnets (RE = Gd,..., Tm}) in the paramagnetic range, characterized by so called flipping temperature Tf. Parimagnetism is explained as a short-range anti-parallel coupling between magnetization of Co clusters and rare earth magnetic moments. An interesting compound is TmCo2, which comes from its position at the end of this RECo2 series [1,2]. There are few discrepancies in the literature concerning ordering temperatures TC and magnetic states of the cobalt sublattice [3,4]. Moreover, it exhibits almost no pressure dependence of characteristic temperatures (TC and Tf). To clarify our results obtained on the polycrystalline sample, we’ve grown several single crystals. The progress of preparation and up-to-date measured data will be discussed in the presentation.
[1] J. Herrero-Albillos et al., Physical Review B 76, 094409 (2007)
[2] F. Bartolomé et al., Eur. Phys. J. 86, 489 (2013)
[3] E. Gratz et al., JPCM 7, 597 (1995)
[4] C. M. Bonilla et al., JPCM 26, 156001 (2014)