Direct imaging of lattice strain-induced stripe phases in an optimally-doped manganite

Details Direct imaging of lattice strain-induced stripe phases in an optimally-doped manganite Direct imaging of lattice strain-induced stripe phases in an optimally-doped manganite

2006-05-29

arxiv.org/abs/cond-mat/0605712v2

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1103/PhysRevB.75.172407

In a manganite film without quenched disorder, we show texturing in the form of insulating and metallic stripes above and below Curie temperature (Tc), respectively, by high resolution scanning tunneling microscopy/spectroscopy (STM/STS). The formation of these stripes involves competing orbital and charge orders, and are an outcome of overlapping electron wave-functions mediated by long-range lattice strain. Contrary to popular perception, electronically homogeneous stripe phase underlines the efficacy of the lattice strain in bringing about charge density modulation and in impeding the cross-talk between the order parameters, which otherwise evolves inhomogeneously in the form of orbitally-ordered insulating and orbitally disordered metallic phases.

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