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Evidence for the strong effect of quenched correlated disorder on phase separation and magnetism in (La<sub>1 โ y</sub>Pr<sub>y</sub>)<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>
High resolution neutron diffraction shows that the mesoscopic separation into ferromagnetic (FM) and antiferromagnetic (AFM) phases and the FM transition temperature T(C) in the perovskite manganite (La(1-y)Pr(y))(0.7)Ca(0.3)MnO(3) strongly depend on the quenched correlated disorder. The different disorder strengths are achieved by different procedures of the sample synthesis and are quantitatively โฆ