# Direct observation of large electronic domains with memory effect in doped manganites

Sarma, DD and Topwal, Dinesh and Manju, U and Krishnakumar, SR and Bertolo, M and Rosa, La S and Cautero, G and Koo, TY and Sharma, PA and Cheong, SW and Fujimori, A (2004) Direct observation of large electronic domains with memory effect in doped manganites. In: Physical Review Letters, 93 (9). 097202/1-12.

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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 $La_{\mathrm{1/4}}Pr_{\matrm{3/8}}Ca_{3/8}MnO_{\mathrm{3}}$,establishing the formation of distinct insulating domains embedded inthe metallic host at low temperatures. These domains are found to be atleast 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.