Anamitra Mukherjee, William S. Cole, Nandini Trivedi, Mohit Randeria, Patrick Woodward
We show that applying strain on half-doped manganites makes it possible to tune the system to the proximity of a metal-insulator transition and thereby generate a colossal magnetoresistance (CMR) response. From our realistic microscopic model of strain and magneto-transport calculations within the Kubo formalism, we demonstrate that under tensile strain a ferromagnetic charge ordered insulator, previously inaccessible to experiments, becomes stable. The phase competition not only allows control of CMR in ferromagnetic metallic manganites but further generates CMR response in otherwise robust insulators at half doping.
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http://arxiv.org/abs/1209.6174
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