In the midinfrared 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 antiparallel to that of the host ion. The Hund's, crystal-field, and Jahn-Teller splittings for the Mn3+ ions in a Mn4+ matrix can also be derived.
Infrared observation of the Hund's mechanism in an electron-doped manganite
Nucara A;Calvani P;Lupi S;
2006
Abstract
In the midinfrared 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 antiparallel to that of the host ion. The Hund's, crystal-field, and Jahn-Teller splittings for the Mn3+ ions in a Mn4+ matrix can also be derived.File in questo prodotto:
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