Charge transport and magnetization profile at the interface between the correlated metal CaRuO3 and the antiferromagnetic insulator CaMnO3

A combination of spectroscopic probes was used to develop a detailed experimental description of the transport and magnetic properties of superlattices composed of the paramagnetic metal CaRuO 3 and the antiferromagnetic insulator CaMnO 3. The charge-carrier density and Ru valence state in the super...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2010-01, Vol.81 (9)
Main Authors: W. Freeland, J., Chakhalian, J., V. Boris, A., Tonnerre, Jean-Marc, Kavich, J.J., Yordanov, P., Grenier, Stéphane, Zschack, P., Karapetrova, E., Popovich, P., N. Lee, H., Keimer, B.
Format: Article
Language:English
Subjects:
CHARGE CARRIERS
CHARGE TRANSPORT
Condensed Matter
FUNCTIONALS
MAGNETIC PROPERTIES
MAGNETIZATION
Physics
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
POLARIZATION
POLARONS
PROBES
Strongly Correlated Electrons
SUPERLATTICES
TRANSPORT
VALENCE
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Summary:A combination of spectroscopic probes was used to develop a detailed experimental description of the transport and magnetic properties of superlattices composed of the paramagnetic metal CaRuO 3 and the antiferromagnetic insulator CaMnO 3. The charge-carrier density and Ru valence state in the superlattices are not significantly different from those of bulk CaRuO 3. The small charge transfer across the interface implied by these observations confirms predictions derived from density-functional calculations. However, a ferromagnetic polarization due to canted Mn spins penetrates 3-4 unit cells into CaMnO 3 , far exceeding the corresponding predictions. The discrepancy may indicate the formation of magnetic polarons at the interface.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.81.094414