Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-07-30
Physics
Condensed Matter
Strongly Correlated Electrons
Short paper, 4 figures, to appear in Rapid Communication
Scientific paper
10.1103/PhysRevB.64.140406
In this paper, we report polarized optical microscopy and electrical transport studies of manganese oxides that reveal that the charge ordering transition in these compounds exhibits typical signatures of a martensitic transformation. We demonstrate that specific electronic properties of charge-ordered manganites stem from a combination of martensitic accommodation strain and effects of strong electron correlations. This intrinsic strain is strongly affected by the grain boundaries in ceramic samples. Consistently, our studies show a remarkable enhancement of low field magnetoresistance and the grain size effect on the resistivity in polycrystalline samples and suggest that the transport properties of this class of manganites are governed by the charge-disordered insulating phase stabilized at low temperature by virtue of martensitic accommodation strain. High sensitivity of this phase to strains and magnetic field leads to a variety of striking phenomena, such as unusually high magnetoresistance (10^10 %) in low magnetic fields.
Cheong Sang-Wook
Gershenson Michael E.
Kim Bog G.
Kiryukhin V.
Podzorov Vitaly
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