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
La1=4Pr3=8Ca3=8MnO3, 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.
