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

被引：43

作者：

Orgiani, P. ^{[1
,2
]}

Galdi, A. ^{[1
,3
]}

Aruta, C. ^{[4
,5
]}

Cataudella, V. ^{[4
,5
]}

De Filippis, G. ^{[4
,5
]}

Perroni, C. A. ^{[4
,5
]}

Ramaglia, V. Marigliano ^{[4
,5
]}

Ciancio, R. ^{[6
]}

Brookes, N. B. ^{[7
]}

Moretti Sala, M. ^{[8
,9
]}

Ghiringhelli, G. ^{[8
,9
]}

Maritato, L. ^{[1
,2
]}

机构：

[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 II, 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

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 20期

关键词：

D O I：

10.1103/PhysRevB.82.205122

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 Mn3+ and Mn4+ 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 Mn2+ ions, in La-deficient LaxMnO3-delta thin films. X-ray absorption spectroscopy demonstrated the relevant presence of Mn2+ ions, which is unambiguously proved to be substituted at La site by resonant inelastic x-ray scattering. Mn2+ is proved to be directly correlated with the enhanced magnetotransport properties because of an additional hopping mechanism trough interfiling Mn2+ ions. Such a scenario has been theoretically confirmed by calculations within the effective single-band model. The use of Mn2+ 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.

引用

页数：6

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