Talks and Poster Presentations (without Proceedings-Entry):
H. Michor, F. Failamani, A. Grytsiv, G. Giester, H. Müller, E. Bauer, P. Rogl:
"Ferromagnetic Kondo lattice behaviour of CeZn(Zn0.29Si0.71)2";
Talk: ICM 2015, 20th International Conference onMagnetism,
We report on the ferromagnetic Kondo lattice behavior of novel CeZn(Zn
0.29Si0.71)2, which was studied by means of ac and dc magnetic susceptibility, specific heat and resistivity measurements on flux-‐
grown single crystals as well as on sintered bulk samples. The orthorhombic CeNiSi2-‐type phase CeZn(Zn0.29Si0.71)2 [space group Cmcm, a=0.42079(1), b=1.765218(3), c=0.41619(1) nm] was identified in the course of an investigation of the phase equilibria in the Ce-‐Zn
-‐Si system (<33.3 at.% Ce) in Ref. . Field dependent isothermal well as temperature dependent magnetisation measurements reveal ferromagnetic ordering of CeZn(Zn0.29Si0.71)2 below about Tc=4.4 K with a magnetically ordered moment near 1 μB/Ce at 1.9 K and 6 T. The corresponding specific heat anomaly at 4.4 K displays a significantly reduced magnitude as compared to the value expected from a basic local moment mean-‐field approach and is analysed in terms of a simple model for a ferromagnetic Kondo lattice system based on the resonant level model by Schotte and Schotte , thus, yielding parameters for the ferromagnetic exchange coupling J=14.6 K and the Kondo temperature TK=5 K. The effective paramagnetic moment of Ce, μeff = 2.5 μB, obtained from a Curie--. Weiss fit suggest that the
ground state of Ce-‐ions in this compound is close to 3+.
Created from the Publication Database of the Vienna University of Technology.