Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 68: Poster 5

MA 68.19: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG4

Investigation of pyrochlore spin-ice compounds with reduced lattice parameters — •T. Stöter1,2, M. Antlauf3, L. Opherden2, M. Doerr1, E. Kroke3, T. Herrmannsdörfer2, and J. Wosnitza1,21Institut für Festkörperphysik/TU Dresden — 2Hochfeld-Magnetlabor Dresden/Helmholtz-Zentrum Dresden-Rossendorf — 3Institut für Anorganische Chemie/TU Bergakademie Freiberg

The pyrochlores R2X2O7 (R = rare earth, X = Ti, Ge, Sn, Hf, …) have attracted interest for their geometrical frustration from which unusual magnetic states such as spin-ice emerge. Possibly, the effective interaction comes from the competition of dipolar and exchange interaction. The strength of these competing interactions strongly depends on the distance between magnetic moments, i.e., the lattice parameters. Materials with small lattice parameters are most promising to have new interesting properties. The germanate pyrochlore Dy2Ge2O7 possesses one of the smallest known lattice constants (a = 9.929 Å), requiring high pressures over 5 GPa for its synthesis. Additionally, we applied high-pressure synthesis of more than 10 GPa to produce pyrochlores with even smaller lattice parameters by partially substituting silicon for germanium using the multianvil technique. First results on the evolution of magnetization and susceptibility down to cryogenic temperatures will be reported.

The work is supported by DFG (SFB 1143).

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