DOI: 10.1103/physrevb.73.054425
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Abstract: In the mid-infrared absorption of Sr1−xCexMnO3 at low electron doping (x = 0.05), a band at 0.3 eV is fully replaced by another one at 0.9 eV as the system becomes antiferromagnetic (AF) of type G. A weaker effect occurs at x = 0.10 for an AF phase of type C. One thus directly measures the electron hopping energies for spin parallel and anti-parallel to that of the host ion. The Hund's, crystal-field, and Jahn-Teller splittings for the Mn 3+ ions in a Mn 4+ matrix, can also be derived.