  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.
