Dresden 2020 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 46: Poster Session: Frustrated Magnets, Quantum Magnets, Charge Order and Complex Oxids

TT 46.21: Poster

Mittwoch, 18. März 2020, 15:00–19:00, P2/2OG

Angular dependence of the Raman scattering intensity of optical phonons in rare-earth germanate pyrochlore single crystals — •Christian Röder1,2, Nathan Leubner2, Mathis Antlauf3, Takashi Taniguchi4, Marcus Schwarz3, Edwin Kroke3, and Jens Kortus21TU Bergakademie Freiberg, Institute of Applied Physics, D-09599 Freiberg, Germany — 2TU Bergakademie Freiberg, Institute of Theoretical Physics, D-09599 Freiberg, Germany — 3TU Bergakademie Freiberg, Institute of Inorganic Chemistry, D-09599 Freiberg, Germany — 4National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki, 305-0044 Japan.

Rare-earth (RE) pyrochlores are one of the most interesting groups of materials to study geometrically frustrated magnetism. In this work, the vibrational properties of RE germanates (RE = Er, Ho, Dy, Tb) of pyrochlore structure were studied by Raman scattering at room temperature. The phonon assignment in the case of similar pyrochlores such as titanates, zirconates or stannates is still debated in literature. Angular dependent Raman measurements were performed in backscattering geometry using single crystals of Ho2Ge2O7 and Dy2Ge2O7. The observed Raman scattering intensity as function of the azimuthal angle reveals a unique behavior for each phonon mode symmetry. The experimental results are complemented by theoretical simulations of the Raman scattering intensity allowing for an unambiguous assignment of the phonon mode symmetry.
This work was financially supported by German Research Foundation within SFB 1143.

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