Regensburg 2004 – wissenschaftliches Programm

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MA: Magnetismus

MA 13: Poster:Schichten(1-23),Spinabh.Trsp(24-41),Exch.Bias(42-56),Spindyn.(57-67),Mikromag.(68-76),Partikel(77-90),Spinelektr.(91-97),Elektr.Theo.(98-99),Mikromag+PhasÜ+Aniso.(100-105),Magn.Mat.(106-118),Messmethod.(119-121),Obflm.+Abbverf.(122-123)

MA 13.28: Poster

Dienstag, 9. März 2004, 15:00–19:00, Bereich A

Scaling of the Extraordinary Hall Effect in Manganite Films — •M. Ziese — Division of Superconductivity and Magnetism, University of Leipzig, Linnéstrasse 5, 04103 Leipzig.

There has been a long-standing debate about the anomalous Hall effect in manganites. Whereas traditionalists explained the data in the conventional side-jump und skew-scattering models, other groups argued in favour of a new mechanism induced by the Berry phase. Strong support for the latter came from reports of a one-parameter scaling of the Hall effect with the reduced magnetization [1]. Using Hall effect data measured on La_0.7Ca_0.3MnO₃ and La_0.7Ba_0.3MnO₃ films it is shown that a one-parameter scaling does not hold; instead a two-parameter scaling is observed. The scaling function can be derived within the basic double exchange model assuming a side jump mechanism.

[1] Y. Lyanda-Geller, S. H. Chun, M. B. Salamon, P. M. Goldbart, P. D. Han, Y. Tomioka, A. Asamitsu and Y. Tokura, Phys. Rev. B 63, 184426 (2001).