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Signatures of enhanced ordering temperatures in digital superlattices of
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Image of FIG. 1.
FIG. 1.

X-ray characterization of superlattices and a random alloy film. The data have been individually shifted along the intensity axis for clarity.

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

(a) as a function of magnetic field at ; (b) MR as a function of temperature at .

Image of FIG. 4.
FIG. 4.

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 .


Generic image for table
Table I.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Signatures of enhanced ordering temperatures in digital superlattices of (LaMnO3)m∕(SrMnO3)2m