Polaronic state and nanometer-scale phase separation in colossal magnetoresistive manganites

Details Polaronic state and nanometer-scale phase separation in colossal magnetoresistive manganites Polaronic state and nanometer-scale phase separation in colossal magnetoresistive manganites

2007-05-29

arxiv.org/abs/0705.4243v1

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/0295-5075/83/17009

High resolution topographic images obtained by scanning tunneling microscope in the insulating state of Pr0.68Pb0.32MnO3 single crystals showed regular stripe-like or zigzag patterns on a width scale of 0.4 - 0.5 nm confirming a high temperature polaronic state. Spectroscopic studies revealed inhomogeneous maps of zero-bias conductance with small patches of metallic clusters on length scale of 2 - 3 nm only within a narrow temperature range close to the metal-insulator transition. The results give a direct observation of polarons in the insulating state, phase separation of nanometer-scale metallic clusters in the paramagnetic metallic state, and a homogeneous ferromagnetic state.

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