Direct observation of electronic domains in manganites by spatially resolved spectroscopy

Details Direct observation of electronic domains in manganites by spatially resolved spectroscopy Direct observation of electronic domains in manganites by spatially resolved spectroscopy

2004-09-14

arxiv.org/abs/cond-mat/0409343v1

Phys. Rev. Lett.; 93, 097202, (2004)

Physics

Condensed Matter

Materials Science

8 pages of text and figures. "To appear as Elettra - Highlights 2004; a slightly different version has appeared in Phys. Rev.

Scientific paper

We use a spatially resolved, direct spectroscopic probe for electronic structure with an additional sensitivity to chemical compositions to investigate high-quality single crystal samples of La_{1/4}Pr_{3/8}Ca_{3/8}MnO_{3}, establishing the formation of distinct insulating domains embedded in the metallic host at low temperatures. These domains are found to be at least an order of magnitude larger in size compared to previous estimates and exhibit memory effects on temperature cycling in the absence of any perceptible chemical inhomogeneity, suggesting long-range strains as the probable origin.

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