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- W2020493378 abstract "We discuss the phase diagram of the two-orbital model of half-doped manganites by calculating self-consistently the Jahn-Teller (JT) distortion patterns, charge, orbital and magnetic order at zero temperature. We analyse the instabilities of these phases caused by electron or hole doping away from half-doping, or by the application of a magnetic-field. For the CE insulating phase of half-doped manganites, in the intermediate JT coupling regime, we show that there is a competition between canting of spins (which promotes mobile carriers) and polaronic self-trapping of carriers by JT defects. This results in a marked particle-hole asymmetry, with canting winning only on the electron doped side of half-doping. We also show that the CE phase undergoes a first-order transition to a ferromagnetic metallic phase when a magnetic-field is applied, with abrupt changes in the lattice distortion patterns. We discuss the factors that govern the intriguingly small scale of the transition fields. We argue that the ferromagnetic metallic phases involved have two types of charge carriers, localised and band-like, leading to an effective two-fluid model." @default.
- W2020493378 created "2016-06-24" @default.
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- W2020493378 date "2006-01-31" @default.
- W2020493378 modified "2023-10-14" @default.
- W2020493378 title "Instabilities and insulator-metal transitions in half-doped manganites induced by magnetic-field and doping" @default.
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- W2020493378 doi "https://doi.org/10.1103/physrevb.73.035218" @default.
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