Dresden 2003 – scientific programme
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MA: Magnetismus
MA 14: Poster: Schichten(1-31), Spinabh.Trsp.(32-47), Exch.Bias(48-54), Spindyn.(55-64), Mikromag.(65-76), Partikel(77-88), Oflmag.(89-92), Spinelektr.(93-98), Elektr.Theo.(99-103), Mikromag+PhasÜ+Aniso.(104-122), MagnMat.(123-134), Messm+Mol-Mag.(135-139), Kondo(140-151)
MA 14.104: Poster
Tuesday, March 25, 2003, 15:15–19:15, Zelt
Magnetic properties in chromium-chalcogenides systems — •Diana Benea1, Hubert Ebert1, Wolfgang Bensch2, and Zhong-Le Huang2 — 1Chemistry Department, University Munich, Butenandtstr. 5-13, D-81377 Munich, Germany — 2Institute for Anorganic Chemistry, Olshausenerstr. 40, D-24098, Kiel, Germany
A theoretical investigation of magnetic properties of the systems CrS,
CrSe1−xTex and
Cr1+y(Se,Te)2 is presented.
In binary chromium selenides and sulphides Cr has a rather large spin
magnetic moment of about 3 µB.
The exchange interactions are
predominanty antiferromagnetic in these compounds, in contrast to the
ferromagnetically ordered chromium tellurides. The
magnetic phase
diagram of the system CrSexTe1−x derived from neutron scattering,
show for x=0 − 0.4
ferromagnetic order with magnetic the moments within the basis plane.
The alloys with x=0.7 − 1.0 are antiferromagnetic
with an umbrella-like non-collinear ordering of the magnetic moments
below the Néel temperature. In the region x=0.2 − 0.6 there is a
delicate
balance between both ferro- and antiferromagnetic ordering with
respect to the temperature and concentration.
The magnetic behaviour of the systems has been investigated using the
Korringa-Kohn-Rostoker (KKR) band structure method. The disorder in the
system has been accounted for by means of the Coherent Potential
Approximation (CPA). The magnetic moments and phase stability of
these compounds will be discussed.