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

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

2009-03-26

arxiv.org/abs/0903.4663v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

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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