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arXiv · 0903.4663

Charge transport and magnetization profile at the interface between a correlated metal and an antiferromagnetic insulator

J. W. Freeland·J. Chakhalian·A. V. Boris·J. -M. Tonnerre·J. J. Kavich·P. Yordanov·S. Grenier·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 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.

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J. W. Freeland, J. Chakhalian, A. V. Boris, J. -M. Tonnerre, J. J. Kavich, P. Yordanov, S. Grenier, P. Popovich, H. N. Lee, B. Keimer. 2009-03-26. Charge transport and magnetization profile at the interface between a correlated metal and an antiferromagnetic insulator. https://doi.org/10.1103/physrevb.81.094414

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