Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 38: Multiferroics

MA 38.10: Vortrag

Donnerstag, 26. März 2009, 17:45–18:00, HSZ 103

Multiferrocity in MnWO₄: anomalous ultrasonic dissipation and spin phonon coupling — •Alexander Doering¹, Peter Lemmens¹, Dietrich Wulferding¹, Sergei Zherlitsyn², Christophe Payen³, Jubo Peng⁴, and Chengtian Lin⁴ — ¹IPKM, TU Braunschweig, Germany — ²FZD, Dresden, Germany — ³IMN, CNRS, Nantes, France — ⁴MPI-FKF, Stuttgart, Germany

Ultrasound spectroscopy on the multiferroic MnWO₄ show anomalies in the magnetic phase diagram crossing the PM/AF and the AF/spiralAF-polar phase. The scaling of the temperature dependence of the sound velocity is comparable to YMnO₃. The sound attenuation show an anomalous, strongly asymmetric peak attributed to excitations with coupled spin-polar character. Work supported by DFG and ESF-HFM.