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

J. W. Freeland, J. Chakhalian, A. V. Boris, J. M. Tonnerre, J. J. Kavich, P. Yordanov, S. Grenier, P. Zschack, E. Karapetrova, P. Popovich, H. N. Lee, B. Keimer

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Abstract

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 CaRuO3 and the antiferromagnetic insulator CaMnO3. The charge-carrier density and Ru valence state in the superlattices are not significantly different from those of bulk CaRuO3. 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 CaMnO13, far exceeding the corresponding predictions. The discrepancy may indicate the formation of magnetic polarons at the interface.

Original languageEnglish
Article number094414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number9
DOIs
StatePublished - Mar 12 2010

Funding

FundersFunder number
Directorate for Mathematical and Physical Sciences0747808

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