Changes of electronic structure across the insulator-to-metal transition of quasi-two-dimensional Na-intercalated β-HfNCl studied by photoemission and x-ray absorption
Changes of electronic structure across the insulator-to-metal transition of quasi-two-dimensional Na-intercalated β-HfNCl studied by photoemission and x-ray absorption
复制标题
通过光电发射和 X 射线吸收研究准二维 Na 插层 β-HfNCl 绝缘体到金属转变过程中电子结构的变化
DOI：
10.1103/physrevb.64.153107
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发表时间：
2001
影响因子：
3.7
通讯作者：
Takashi Takahashi
中科院分区：
文献类型：
--
作者：
T. Yokoya;Y. Ishiwata;Shik Shin;S. Shamoto;K. Iizawa;T. Kajitani;I. Hase;Takashi Takahashi
我们利用光电发射（PE）和x射线吸收（XA）光谱研究了β-HfNCl和Na 0.22 HfNCl的插层电子结构的变化。在Na 0.22 HfNCl中，PE在β-HfNCl的间隙内出现了新的态，而亲本价带特征的能量位置变化可以忽略不计，表明其为非刚性带行为。n1s XA结果表明，Na 0.22 HfNCl的导带尾部具有准二维特征，延伸到比β-HfNCl更低的能量。该研究提供了关于新型超导体的电子结构及其在绝缘体到金属过渡过程中的变化的信息。
We use photoemission (PE) and x-ray absorption (XA) spectroscopy to study intercalation-induced changes in the electronic structure of β-HfNCl and Na 0.22 HfNCl. PE shows appearance of new states in Na 0.22 HfNCl within the gap of β-HfNCl, with negligible changes in the energy positions of valence-band features of the parent, suggesting a non-rigid-band behavior. N 1 s XA results show that the tail of the conduction band, with a quasi-two-dimensional character, extends to lower energy in Na 0.22 HfNCl than in β-HfNCl. The study provides information on the electronic structure and its change across the insulator-to-metal transition of the new class of superconductors.