Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 64: Poster 1

MA 64.14: Poster

Friday, March 24, 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. Yakovlev^1,3, and Manfred Bayer^1,3 — ¹Experimentelle 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.