Münster 1997 – wissenschaftliches Programm

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AM: Magnetismus

AM 20: Spektroskopie, Dichroismus III

AM 20.2: Vortrag

Donnerstag, 20. März 1997, 11:00–11:15, F5

Theory for the giant magneto-optical Kerr rotation in CeSb — •U. Pustogowa¹, W. Hübner², and K.H. Bennemann² — ¹Institut für Technische Elektrochemie, Technische Universität Wien, Getreidemarkt 9/158, A-1060 Wien — ²Institut für Theoretische Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin

We calculate the linear magneto-optical Kerr rotation angle for CeSb in the near-infrared spectral range. Assuming large spin-orbit coupling and optical transitions which are allowed only for one spin type we find at ℏ ω = 0.46 eV a Kerr rotation of 90^∘ which then for increasing ω jumps to -90^∘ in very good agreement with recent experimental observation [1]. In contrast to the giant Kerr rotations in nonlinear optics this resonance is mainly determined by the spin-orbit splitting and the plasma frequency and depends sensitively on the dominant optical transitions.

[1] R. Pittini, J. Schoenes, O. Vogt, and P. Wachter, Phys. Rev. Lett. 77, 944 (1996)