Optical Study of Interactions in a $d$-Electron Kondo Lattice with Ferromagnetism

K. S. Burch, A. Schafgans, N. P. Butch, T. A. Sayles, M. B. Maple, B. C. Sales, D. Mandrus, D. N. Basov.
Optical Study of Interactions in a $d$-Electron Kondo Lattice with Ferromagnetism
Phys. Rev. Lett. 95, 046401 (2005)