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Magnetization distribution in CoS2: is it a half metallic ferromagnet?
journal contribution
posted on 2006-05-11, 11:32 authored by P.J. Brown, Klaus-Ulrich Neumann, A. Simon, F. Ueno, K.R.A. ZiebeckPolarized neutron diffraction has been used to determine the spatial distribution
of the magnetization in CoS2 and its temperature dependence. Although the
previously reported ground statemoment 0.84μB is non-integral, the compound
has sometimes been classified as a halfmetallic ferromagnet. The present results
show that the ferromagnetic phase cannot have half metallic properties. The
magnetization distribution around the Co2+ ions in the ferromagnetic phase
at 1.8 K is nearly spherical, indicating that, contrary to electronic structure
calculations, electrons both of eg and t2g character contribute to the observed
magnetic moment. The orbital contribution to the moment is found to be small,
a factor of two less than that determined from magnetic circular dichroism
measurements. A small moment, approximately 2% of that on the cobalt ions,
resides on the sulfur atoms at 1.8 K. The magnetization distribution induced in
the paramagnetic phase by a field of 9.6 T at 150 K is significantly different
from that in the ferromagnetic state and has the asphericity characteristic of
eg electrons. On heating to 300 K and then to 400 K the t2g character of
the magnetization increases continuously and becomes predominant above the
anomaly in the susceptibility at 350 K.
History
School
- Science
Department
- Physics
Pages
164003 bytesCitation
BROWN et al, 2005. Magnetization distribution in CoS2: is it a half metallic ferromagnet? Journal of Physics: Condensed Matter, 17 (10), pp.1583–1592Publisher
© Institute of PhysicsPublication date
2005Notes
This article has been published in the journal, Journal of Physics: Condensed Matter [© Institute of Physics]. The definitive version is available at: http://www.iop.org/EJ/journal/JPhysCM.ISSN
0953-8984Language
- en