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MA: Magnetismus

MA 5: Spin-Structures and Magnetic Phase Transitions I

MA 5.10: Vortrag

Montag, 27. März 2006, 12:30–12:45, HSZ 403

An NMR analysis of magnetically ordered RMn₆Ge_6−xGa_x-compounds — •Jens Schnelzer, Richard Montbrun, and Elmar Dormann — Physikalisches Institut, Universität Karlsruhe (TH), D-76131 Karlsruhe

The RMn₆Ge_6−xGa_x-compounds (R: Rare earth element) crystallize in the HfFe₆Ge₆-type structure, in which the Mn-sites are located in ferromagnetic Kagomé-nets. The R and the three inequivalent Ge-sites are arranged in hexagonal lattice sites. The influence of the variable Ga-proportion on the type of magnetic order is known and that on the NMR spectra are examined here. Spectra obtained by Nuclear Magnetic Resonance, showing zero-field ⁷³Ge,⁵⁵Mn and ^69,71Ga resonance positions, as well as the rf-power dependent behavior, will be presented for R=Lu,Tm,Er and Ho. They can be related to the x-dependent varying magnetic structure of these compounds.
We thank G. Venturini, Nancy, for providing the samples and the Graduiertenkolleg 284 (DPG) for financial support.