7 / 20
I n t e r n a t i o n a l C o n f e r e n c e o n
Metal, Mining and
Magnetic Materials
Journal of Material Sciences
ISSN: 2321-6212
N o v e m b e r 0 1 - 0 2 , 2 0 1 8
P a r i s , F r a n c e
Metal and Magnetism 2018
Page 27
Richard Weihrich et al., J Mat. Sci. 2018, Volume:6
DOI: 10.4172/2321-6212-C7-032
S
n
2
Co
3
S
2
, a highly anisotropic S½ half metal ferromagnet (HFM) was just
found as magnetic Weyl semimetal with intrinsic giant anomalous Hall
Effect (AHE). The compounds was first prepared in our institute in 1979,
predicted as HFM in 2001 and characterised as half antiperovskite SnCo
3/2
S.
It crystallizes in shandite type structure i.e. Pb
2
Ni
3
S
2
. When its ferromagnetism
with TC=176 K was investigated by DFT calculations, a fascinating half metal
S=½ ground state was discovered. The prediction of the magnetic state was
confirmed from experimental investigations on single crystals that have
further shown a completely anisotropic out-of-plane magnetic ordering of
spins in Kagomé-layers of Co atoms. Studies on its magnetism in the following
decades finally led to the recent discoveries of topological properties and a
giant anomalous hall effect. Here, we review the crystal and electronic structure
of Sn
2
Co
3
S
2
=SnCo
3/2
S including the concept of half anti-perovskites (HAP) that
was developed from the relation to MgNi
3
C..
Biography
R. Weihrich has completed his PhD at the age of 28 years at
the University of Regensburg, followed by postdoctoral studies
at CNRS Bordeaux, Paris, and Dresden. He is Professor at the
University of Augsburg. He has published more than 75 papers
in reputed journals.
richard.weihrich@mrm.uni-augsburg.deShandite type Co
3
Sn
2
S
2
= Sn
2
Co
3
S
2
– story, structure, magnetism
Richard Weihrich
1,2
, Florian Pielnhofer
2
1
University of Augsburg, Germany
2
University of Regensburg, Germany