Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1803943 | Journal of Magnetism and Magnetic Materials | 2007 | 8 Pages |
Abstract
Temperature and field-dependent magnetization measurements on polycrystalline CeMnCuSi2 reveal that the Mn moments in this compound exhibit ordering with a ferromagnetic (FM) component ordered instead of the previously reported purely antiferromagnetic (AFM) ordering. The FM ordering temperature, Tc, is about 120Â K and almost unchanged with external fields up to 50Â kOe. Furthermore, an AFM component (such as in a canted spin structure) is observed to be present in this phase, and its orientation is modified rapidly by the external magnetic field. The Ce L3-edge X-ray absorption result shows that the Ce ions in this compound are nearly trivalent, very similar to that in the heavy fermion system CeCu2Si2. Large thermomagnetic irreversibility is observed between the zero-field-cooled (ZFC) and field-cooled (FC) M(T) curves below Tc indicating strong magnetocrystalline anisotropy in the ordered phase. At 5Â K, a metamagnetic-type transition is observed to occur at a critical field of about 8Â kOe, and this critical field decreases with increasing temperature. The FM ordering of the Mn moments in CeMnCuSi2 is consistent with the value of the intralayer Mn-Mn distance RaMn-Mn=2.890Â Ã
, which is greater than the critical value 2.865Â Ã
for FM ordering. Finally, a magnetic phase diagram is constructed for CeMnCuSi2.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
G. Liang, F. Yen, S. Keith, M. Croft,