Magneto-optical properties of Europium hexaboride

Dipta Bhanu Ghosh; Molly De; S. K. De

paper

Magneto-optical properties of Europium hexaboride

arXiv:cond-mat/0406706

Abstract

Full potential spin-polarized self-consistent electronic structure calculation s have been performed on LaB $_{6}$ , EuB $_{6}$ and YbB $_{6}$ using Linear Muffin- Tin Orbital Method. The electronic structure of EuB $_{6}$ shows a small overlap near the Fermi level. This is in disagreement with the recent ARPES study. The r eflectivity spectrum shows a plasma resonance at about 0.3 eV in EuB $_{6}$ . Abso rption starts at about 1.5 eV and it is due to 4 $f$ to 5 $d$ transition. Both the se features are reflected in the magneto-optical Kerr spectrum. At 0.3 eV, there is a rotation of +8 $^{0}$ to -10 $^{0}$ and at 1.5 eV, a rotation of about 0.5 $^{0}$ occurs. The reasonable agreement with MOKE experiment implies that the incl usion of Drude correction is absolutely essential for the treatment of EuB $_{6}$ .