Dresden 2003 – wissenschaftliches Programm

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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 14.52: Poster

Dienstag, 25. März 2003, 15:15–19:15, Zelt

Crystallographic and magnetic structure of Tb₂PdSi₃ — •Matthias Frontzek¹, Andreas Kreyssig¹, Matthias Doerr¹, Holger Bitterlich², Guenther Behr², Jens-Uwe Hoffman³, Dietmar Hohlwein³, and Micheal Loewenhaupt¹ — ¹IAPD, TU Dresden, 01062 Dresden — ²IFW Dresden, Helmholtzstr. 20, 01069 Dresden — ³Hahn-Meitner-Institut, BENSC, Glienicker Strasse 100, 14109 Berlin

The series R₂PdSi₃ (R = rare earth metal), crystallizing in a AlB₂ derived hexagonal structure, have been found to exhibit complex magnetic behavior. Susceptibility measurements on a Tb₂PdSi₃ single crystal show a strong anisotropy between basal plane and the hexagonal c-axis as well as complex magnetic properties. The magnetic rare earth ions occupy the Al positions of the AlB₂ structure while the non-magnetic Pd and Si atoms are supposed to be statistically distributed on the B positions.

We performed a neutron diffraction experiment on E2 at HMI Berlin within a temperature range from 1.5 K to 300 K using a single crystal of high quality. We found a crystallographic superstructure yielding satellite reflections at (1/2, 1/2, L) at room temperature. We determined the values of L to be L = n/8 where n is an integer. The existence of a crystallographic superstructure in ternary intermetallic 2-1-3-compounds was quoted by several authors but never definitely verified. Below the antiferromagnetic ordering temperature of T_N = 24 K we found magnetic satellites at (i/2, j/2, L′) where i, j are integers. In this case the L′ values seem to be L′ = n/16.