- Bc. Jan Moudřík: Magnetic properties of a novel CeCo0.715Si2.285 compound
- 12. 3. 2014, 14:30
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
We report on the basic physical properties of a novel CeCo0.715Si2.285 compound, mainly its rich magnetic phase diagram. Using the Czochralski method single crystals of this compound have been grown for the first time. The compound crystallizes in the I-42m space group structure with extremely elongated unit cell (a = 4.12 A, c = 32.84 A). In a zero magnetic field it orders antiferromagnetically at TN = 10.5 K with another order-to-order transition at 9.5 K. Under application of a magnetic field along the
c-axis it manifests numerous magnetic phases in small fields (B < 500 mT), similar to the so-called "devil's staircase" systems (e.g. CeSb [1], CeRh3Si2 [2], etc.), however, having the high field state stable with respect to field removal. In magnetic fieldsm above 1 T the magnetization is almost unchanged up to 14 T (maximum magnetic field
applied within our study) but considerably reduced (0.3 μB/Ce) with respect to the free Ce3+ ion. The compound also exhibits strong hysteresis of magnetization with respect to varying temperature and magnetic field, respectively. For fields applied along the a-axis a typical behavior for the antiferromagnetic hard axis is observed. Marginally,
progress on the study of CeIr(Si,Ge)3 system (CeIrSi3 [3], CeIrGe3 [4]) will be reported as well.
[1] J. Rossat-Mignod et al., JMMM 52, 111 (1985)
[2] D. Kaczrowski, Phys. B 403, 1362 (2008) DOI: 10.1016/j.physb.2007.10.150
[3] Okuda, Y. et al., J. Phys. Soc. Japan 76, 044708 (2007)
[4] Honda, F. et al., Phys. Rev. B 81, 140507 (2010)