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MA: Fachverband Magnetismus
MA 32: Spin Structures and Magnetic Phase Transitions
MA 32.8: Talk
Wednesday, March 18, 2015, 17:00–17:15, EB 202
Photoluminescence monitoring of magnetic phase transitions in CuB2O4 — •Dennis Kudlacik1, Jörg Debus1, Roman V. Pisarev2, Dmitri R. Yakovlev1,2, and Manfred Bayer1,2 — 1Experimentelle Physik 2, TU Dortmund, Dortmund, Germany — 2Ioffe Physical-Technical Institute, Russian Academy of Sciences, St. Petersburg, Russia
Copper metaborate CuB2O4 comprises two sublattices with different magnetic orderings. At low temperatures below TN = 21 K, CuB2O4 demonstrates an antiferromagnetic ordering and a rich magnetic phase diagram with several phase transitions [1]. Commensurate and incommensurate magnetic orderings are observed as a result of intra-sublattice and inter-sublattice mutual interactions. The study of these interactions for the various magnetic phases of the sublattices shall provide highly promising insights into properties of different kinds of collective spin interactions. In that context, we report on the monitoring of the magnetic phase transitions via photoluminescence (PL). The intensity, linewidth as well as energy of the sublattice PL indicate changes in the magnetic ordering. Hereby, not only the ambient temperature but also the optical pumping intensity can induce a magnetic phase transition. During the decay time of the 4b-sublattice PL of several hundreds of µs, the magnetic phase transitions could be followed in the time domain highlighting the dynamics between the spin, electron and phonon systems.
[1] R. V. Pisarev et al., Phys. Rev. B 88, 024301 (2013).