Berlin 2005 – scientific programme
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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 20.123: Poster
Monday, March 7, 2005, 14:00–18:00, Poster TU C
A nuclear magnetic resonance study of boldRMn6Ge6−xGax-compounds — •Jens Schnelzer und Elmar Dormann — Physikalisches Institut, Universität Karlsruhe (TH); D-76128 Karlsruhe
73Ge-nuclear magnetic resonance spectra on the RMn6Ge6−xGax-series (R=rare earth metal) will be presented.
All representatives of this series have the hexagonal HfFe6Ge6-type structure in common.
These compounds are characterized by ferromagnetic Mn Kagomé layers and by different interplane couplings giving rise to
various magnetic ordering-phenomena such as antiferromagnetic, helical or ferrimagnetic structures, depending on the nature of the R element
and the Ge/Ga-proportion.
The main effect of this substitution is to enhance the relative strength of the ferromagnetic interaction with respect to the antiferromagnetic
one and for critical Ga concentration ferromagnetic or ferrimagnetic structures are stabilized.
The influence of these different magnetization configurations on the NMR spectra is analysed.
We thank G.Venturini, Nancy for providing the samples, and GK 284 (DPG) for financial support.