Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.137: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Substitutional effects in rare earth based half Heusler compounds — •Fred Casper, Vadim Ksenofontov, Gerhard H. Fecher, and Claudia Felser — Johannes Gutenberg - Universität, 55099 Mainz, Germany

Half Heusler compounds offer a variety of half-metallic ferromagnetic materials. This study focuses on Heusler compounds RE_1−xM_xXY containing mixed rare earth - transition metal sublattices, because one expects an interplay of d- and f- electrons with respect to the magnetic properties. The families of compounds RENiBi and REAuSn are of particular interest. GdAuSn is known to be a semiconducting antiferromagnetic compound with T_N ≅ 60K, whereas MnAuSn belongs to the ferromagnetic metals. A dramatic increase of the Neel temperature up to approximately 200 K was found during the study of the doped compound Gd_0.9Mn_0.1AuSn from the series Gd_1−xMn_xAuSn. Gd, Au and Sn Mößbauer spectroscopy is applied to elucidate the magnetic state of the constituents of this compound. Band structure calculations using the FLAPW method provide an insight in the magnetic and electronic properties of doped, rare earth based half Heusler compounds.

(This work is funded by the DFG.)