Magneto-optical Kerr effect in $Eu_{1-x}Ca_{x}B_{6}$

G. Caimi; S. Broderick; H. R. Ott; L. Degiorgi; A. D. Bianchi; Z. Fisk

doi:10.1103/PhysRevB.69.012406

paper

Magneto-optical Kerr effect in $E u_{1 - x} C a_{x} B_{6}$

arXiv:cond-mat/0307475 · doi:10.1103/PhysRevB.69.012406

Abstract

We have measured the magneto-optical Kerr rotation of ferromagnetic $E u_{1 - x} C a_{x} B_{6}$ with x=0.2 and 0.4, as well as of $Y b B_{6}$ serving as the non-magnetic reference material. As previously for $E u B_{6}$ , we could identify a feature at 1 $e V$ in the Kerr response which is related with electronic transitions involving the localized 4f electron states. The absence of this feature in the data for $Y b B_{6}$ confirms the relevance of the partially occupied 4f states in shaping the magneto-optical features of $E u$ -based hexaborides. Disorder by $C a$ -doping broadens the itinerant charge carrier contribution to the magneto-optical spectra.

Magneto-optical Kerr effect in Eu1−x​Cax​B6​

Abstract

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Magneto-optical Kerr effect in $E u_{1 - x} C a_{x} B_{6}$