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X-ray characterization of superlattices and a random alloy film. The data have been individually shifted along the intensity axis for clarity.
Resistivity of superlattices compared to the randomly alloyed film. The peak temperatures for the the , 2, and 3 superlattices and random alloy are 320, 300, 250, and , respectively.
(a) as a function of magnetic field at ; (b) MR as a function of temperature at .
Magnetization of films in the series measured while warming in an applied field of , after cooling to low in . The film shows a sharp rise in magnetization near the temperature where a downturn is observed in the resistivity. The zero-field -cooled magnetization for the same film is strongly suppressed at low .
Measured superlattice period and the error in compared to the targeted values. The error in superlattice stacking is quantified by , where is the average lattice parameter for a single perovskite unit cell within a superlattice, extracted from a film peak near the 002 peak.
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