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arXiv 0707.2127cond-mat.mtrl-sci
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氧空位对HfO $_2$薄膜电子结构的影响

Influence of oxygen vacancy on the electronic structure of HfO$_2$ film

Deok-Yong Cho, Jae-Min Lee, S. -J. Oh, Hoyoung Jang, J. -Y. Kim, J. -H. Park, A. Tanaka

摘要:

利用软X射线吸收光谱研究了氧缺陷氧化铪(HfO $_{\sim1.8}$)的O-$K$和Hf-$N_3$边的电子结构的未占据部分.在O $K$边谱中观察到了Hf 5 $d$未占据带下的带尾态,结合紫外光电子能谱,表明Hf 5 $d$态占据不可忽略.然而,Hf $N_3$边缘磁性圆二色性光谱揭示了在氧化物中的长程铁磁自旋顺序的情况下。因此,与最近的报道相反,空位形成所获得的少量$d$电子不显示位间关联[M. Venkatesan { \it等人},Nature { \bf 430},630(2004)]。

英文摘要:

We investigated the unoccupied part of the electronic structure of the oxygen-deficient hafnium oxide (HfO$_{\sim1.8}$) using soft x-ray absorption spectroscopy at O $K$ and Hf $N_3$ edges. Band-tail states beneath the unoccupied Hf 5$d$ band are observed in the O $K$-edge spectra; combined with ultraviolet photoemission spectrum, this indicates the non-negligible occupation of Hf 5$d$ state. However, Hf $N_3$-edge magnetic circular dichroism spectrum reveals the absence of a long-range ferromagnetic spin order in the oxide. Thus the small amount of $d$ electron gained by the vacancy formation does not show inter-site correlation, contrary to a recent report [M. Venkatesan {\it et al.}, Nature {\bf 430}, 630 (2004)].

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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