Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 7: Postersession Matter at Low Temperature: Materials

TT 7.5: Poster

Montag, 23. März 2009, 13:00–16:45, P1B

Antiferromagnetic resonance in multiferroic YMnO₃ and LuMnO₃ — •D. Kamensky, M. Ozerov, E. Čižmár, J. Wosnitza, and S. Zvyagin — Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden - Rossendorf, 01314 Dresden, Germany

Multiferroic rare-earth manganites have attracted much attention because of the coexistence of ferroelectric and magnetic order. Combining conventional far-infrared Fourier-transform and THz-range free electron laser electron spin resonance (ESR) techniques, magnetic excitations in the hexagonal multiferroic materials YMnO₃ and LuMnO₃ have been studied. In the antiferromagnetically (AFM) ordered phase the gap in the excitation spectrum (∼ 42 and ∼ 48 cm⁻¹ for YMnO₃ and LuMnO₃, respectively) was observed directly. Similar slope of the frequency-field dependences of the AFM resonance modes, ∼ 0.5 cm⁻¹/T, was found for both compounds. A fine structure of the AFM resonance absorption has been revealed by means of high-resolution ESR techniques, which can be explained taking into account a finite interaction between the neighboring Mn³⁺ layers.

The work was done in collaboration with A.K. Kolezhuk, D. Smirnov, H.D. Zhou, and C.R. Wiebe.