Orbital-State-Mediated Phase-Control of Manganites

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Abstract
Using the epitaxial strain, the magnetic and electronic phases can be controlled for thin films of the manganites, La 1- x Sr x MnO 3 , grown on perovskite substrates with various lattice parameters. The strain-induced orbital-ordering (disordering) via coupling with the cooperative Jahn-Teller distortion produces different spin-structures, such as ferromagnetic, layer-type or chain-type antiferromagnetic states, and hence different magnetoelectronic characteristics. The spin-orbital phase diagram for La 1- x Sr x MnO 3 films has been obtained in the plane of strain-field ( c / a ratio) vs doping x , which can be quantitatively reproduced by the density-functional electronic-calculation.