Theory of high-magnetic-field XAS and XMCD spectra at the Yb L and M edges around the field-induced valence transition of YbInCu 4

Abstract

High-magnetic-field XAS and XMCD spectra at the Yb L 2,3 edges of YbInCu 4 are calculated around 30 T, where the field-induced valence transition occurs, by using a new theoretical framework developed recently by the present author. The results are compared with new experimental data, which were measured by Matsuda et al. by utilizing a miniature pulsed magnet up to 40 T. The theory is also extended to the same XAS and XMCD spectra but at the Yb M 5 edge of YbInCu 4, which reflect more directly the field dependence of the Yb 4f electronic states than those at the Yb L 2,3 edges.