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Multiple double-exchange mechanism by Mn2+ doping in manganite compounds (Articolo in rivista)

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Multiple double-exchange mechanism by Mn2+ doping in manganite compounds (Articolo in rivista) (literal)

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Orgiani, P.; Galdi, A.; Aruta, C.; Cataudella, V.; De Filippis, G.; Perroni, C. A.; Ramaglia, V. Marigliano; Ciancio, R.; Brookes, N. B.; Sala, M. Moretti; Ghiringhelli, G.; Maritato, L. (2010)
Multiple double-exchange mechanism by Mn2+ doping in manganite compounds
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

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Orgiani, P.; Galdi, A.; Aruta, C.; Cataudella, V.; De Filippis, G.; Perroni, C. A.; Ramaglia, V. Marigliano; Ciancio, R.; Brookes, N. B.; Sala, M. Moretti; Ghiringhelli, G.; Maritato, L. (literal)

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1. CNR SPIN, I-84084 Fisciano, SA, Italy 2. Univ Salerno, Dept Math & Informat, I-84084 Fisciano, SA, Italy 3. Univ Salerno, Dept Phys, I-84084 Fisciano, SA, Italy 4. CNR SPIN, I-80126 Naples, Italy 5. Univ Naples Federico 2, Dept Phys, I-80126 Naples, Italy 6. CNR IOM, TASC Lab, I-34149 Trieste, Italy 7. European Synchrotron Radiat Facil, F-38043 Grenoble, France 8. CNR SPIN, I-20133 Milan, Italy 9. Politecn Milan, Dept Phys, I-20133 Milan, Italy (literal)

Titolo

Multiple double-exchange mechanism by Mn2+ doping in manganite compounds (literal)

Abstract

Double-exchange (DE) mechanisms in RE(1-x)AE(x)MnO(3) manganites (where RE is a trivalent rare-earth ion and AE is a divalent alkali-earth ion) relies on the strong exchange interaction between two Mn(3+) and Mn(4+) ions through interfiling oxygen 2p states. Nevertheless, the role of RE and AE ions has ever been considered \"silent\" with respect to the DE conducting mechanisms. Here we show that a new path for DE mechanism is indeed possible by partially replacing the RE-AE elements by Mn(2+) ions, in La-deficient La(x)MnO(3-delta) thin films. X-ray absorption spectroscopy demonstrated the relevant presence of Mn(2+) ions, which is unambiguously proved to be substituted at La site by resonant inelastic x-ray scattering. Mn(2+) is proved to be directly correlated with the enhanced magnetotransport properties because of an additional hopping mechanism trough interfiling Mn(2+) ions. Such a scenario has been theoretically confirmed by calculations within the effective single-band model. The use of Mn(2+) both as a doping element and an ion electronically involved in the conduction mechanism reveals an unconventional phenomenon in transport properties of manganites. More important, such a strategy might be also pursed in other strongly correlated materials. (literal)

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