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TT: Fachverband Tiefe Temperaturen

TT 4: Matter at Low Temperature: Materials

TT 4.4: Talk

Monday, February 25, 2008, 10:30–10:45, H 3010

Spin-phonon interactions in antiferromagnetic transition metal monoxides — •Christian Kant, Torsten Rudolf, Franz Mayr, Joachim Deisenhofer, and Alois Loidl — Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86135 Augsburg

Spin-phonon coupling in correlated matter gained a lot of attention in contemporary solid state physics. A fact which was triggered by the observation of phonon splittings in several spinel compounds [1]. Since transition metal monoxides like MnO or NiO are paramount examples for correlated electron systems and Mott-Hubbard insulators it seems to be straightforward to reinvestigate these compounds.

We performed temperature dependent measurements on MnO and NiO by means of far-infrared spectroscopy[2]. The obtained phonon spectra were analyzed in detail. Special attention is focused to the phonon splitting accompanying the transition into the magnetically ordered state.

[1] T. Rudolf et al., New J. Phys. 9, 76 (2007)

[2] T. Rudolf et al., Preprint arXiv:0707.0820