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arXiv 0903.4663cond-mat.str-elcond-mat.mtrl-sci
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关联金属与反铁磁绝缘体界面的电荷输运和磁化强度分布

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

摘要:

光谱探针的组合被用来开发一个详细的实验描述的运输和磁性的超晶格组成的顺磁性金属CaRuO $_3$和反铁磁性绝缘体CaMnO $_3$。超晶格中的载流子密度和Ru的价态与体相CaRuO $_3$没有明显的不同。这些观测结果表明,界面上的小电荷转移证实了密度泛函计算的预测。然而,由于倾斜的Mn自旋导致的铁磁极化穿透3-4个晶胞进入CaMnO $_3$,远远超过相应的预测。这种差异可能表明在界面处形成了磁极化子。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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