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Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.14: Poster

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

Optically detected magnetic resonances for different magnetic phases in CuB2O4 — •Henning Moldenhauer1, Vitalii Yu. Ivanov2, Jörg Debus1, Dennis Kudlacik1, Roman Pisarev3, Dmitri R. Yakovlev1,3, and Manfred Bayer1,31Experimentelle Physik 2, Technische Universität Dortmund, Dortmund, Germany — 2Institute of Physics, Polish Academy of Sciences, Warsaw, Poland — 3Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia

A recent study has shown a direction dependent photoluminescense (PL) of up to 70% in CuB2O4, that means an asymmetry between the opposite directions of the PL emission from the crystal. Moreover, the non-centrosymmetric tetragonal CuB2O4 consists of two sublattices with different magnetic ordering; magnetic phase transitions occur at about 9 K and 21 K. We investigate the magnetic phase transitions and the spatial PL emission asymmetry using the optically detected magnet resonance technique with 60 GHz microwave radiation. We demonstrate strong dependences on the magnetic field direction and microwave radiation power for the spectrally selected PL transitions of the antiferromagnetically ordered sublattice. In that way, we aim at enhancing the understanding of the energy and spin level structure of the sublattices in CuB2O4 at different temperature ranges thus underlying its highly interesting optical and magnetic properties.

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