Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 45: Ferroics and Multiferroics (joint session KFM/TT/MA)

MA 45.8: Vortrag

Donnerstag, 15. März 2018, 12:10–12:30, EMH 225

Far infrared studies on a diluted rare-earth langasite — •Lorenz Bergen¹, Evan Constable¹, Lukas Weymann¹, Alexander A. Mukhin², Nadezhda Kostyuchenko¹, and Andrei Pimenov¹ — ¹Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — ²Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia

Rare-earth langasites demonstrate fascinating structural and magnetic effects such as geometric frustration and are possible candidates for the spin-liquid state. To better understand the interplay between the structural and magnetic properties it is important to study the phonon and crystal electric field spectra that can be observed in the far infrared (FIR) range. The langasite structure crystallizes in the P321 space group with a general formula A₃BC₃D₂O₁₄. Here we present spectra of the diluted rare-earth langasite La_2.91Ho_0.09Ga₅SiO₁₄ using polarized far infrared radiation along different crystallographic directions and under a broad temperature range. The observed phonon frequencies are compared with model calculations. We compare the results on the holmium doped crystal and on pure La₃Ga₅SiO₁₄ langasite.