Abstract
Recently, the doped manganese oxides have been the focus of intensive research due to the remarkable colossal magnetoresistance (CMR) effect observed in the system [1, 2, 3, 4]. The manganites are perovskite oxides with a composition Re1-x A x MnO3, where Re is a rare earth and A is a divalent alkali element. In the doping range of about x ~ 0.2–0.5, the material is ferromagnetic and near the ferromagnetic transition temperature Tc, a large drop of resistance occurs when a magnetic field is applied. The magnetic properties of manganites are traditionally interpreted by the double exchange picture between Mn3+ and Mn4+ [5, 6, 7]. The undoped manganite is an antiferromagnetic (AFM) insulator due to strong correlation effect (superexchange coupling). Doping of divalent cations (Ca, Sr, or Ba) in the Re site induces itinerant holes which hop between the Mn ions. Subject to a strong on-site exchange interaction with localized electrons (the Hund’s rule), these itinerant carriers conserve their spin directions during hopping, giving rise to ferromagnetic (FM) coupling.
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© 1999 Springer Science+Business Media Dordrecht
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Li, Q., Wang, H.S. (1999). Strain and Magnetoresistance Anisotropy of PR0.7SR0.3MNO3 Ultrathin Films. In: Nedkov, I., Ausloos, M. (eds) Nano-Crystalline and Thin Film Magnetic Oxides. NATO Science Series, vol 72. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4493-3_9
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DOI: https://doi.org/10.1007/978-94-011-4493-3_9
Publisher Name: Springer, Dordrecht
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