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

Abstract

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.

References in corpus (10)

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Cited by in corpus (7)

• Nonlinear Hall effect as a signature of electronic phase separation in the semimetallic ferromagnet EuB6
• Influence of ion implantation on the magnetic and transport properties of manganite films
• A high resolution, hard x-ray photoemission investigation of La_(2-2x)Sr_(1+2x)Mn_2O_7 (0.30<x<0.50): on microscopic phase separation and the surface electronic structure of a bilayered CMR manganite
• Direct observation of electronic inhomogeneities induced by point defect disorder in manganite films
• Fingerprint of dynamical charge/spin correlations in the tunneling spectra of colossal magnetoresistive manganites
• Signatures of electronic phase separation in the Hall effect of anisotropically strained La0.67Ca0.33MnO3 films
• Terahertz-nanoscale visualization of the microscopic spin-charge architecture of colossal magnetoresistive switching