Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 108: Spin-Dependent Transport Phenomena II (organized by MA)

TT 108.6: Vortrag

Donnerstag, 19. März 2015, 16:30–16:45, H 0112

Transverse transport and magneto-optical properties of non-collinear antiferromagnets — •Sebastian Wimmer, Ján Minár, Sergiy Mankovsky, Diemo Ködderitzsch, and Hubert Ebert — Ludwig-Maximilians-Universität München, München, Deutschland

Recently, a number of investigations on the anomalous Hall effect (AHE) in materials having nontrivial spin structures, such as non-collinear antiferromagnets, have been performed [1-4]. One especially striking result is the prediction of the AHE for a system with zero net magnetization [3]. We revisit and extend these studies employing a combined group theoretical and first principles approach.

Based exclusively on symmetry considerations the occurence of transverse transport and related optical effects for a given magnetic order of a solid can be predicted. Numerical studies using a first principles electronic structure method in the framework of Korringa-Kohn-Rostoker (KKR) multiple scattering theory and subsequent calculation of response quantities using a Kubo-type linear response formalism are performed to independently cross-check the group theoretical predictions. Our results in part confirm previous findings and furthermore give first numerical estimates of the magnitude of magneto-optical properties experimentally not observed so far.

[1] S. Yoshii, S. Iikubo, T. Kageyama, K. Oda, Y. Kondo, K. Murata, and M. Sato, JPSJ 69, 3777 (2000). [2] T. Tomizawa and H. Kontani, PRB 82, 104412 (2010). [3] H. Chen, Q. Niu, and A. H. MacDonald, PRL 112, 017205 (2014). [4] J. Kübler and C. Felser, arXiv:1410.5985 [cond-mat.mtrl-sci] (2014).