Evolution of local electronic states from a metal to a correlated insulator in aNiS2−xSexsolid solution
Evolution of local electronic states from a metal to a correlated insulator in aNiS2−xSexsolid solution
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DOI：
10.1103/physrevb.70.161103
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发表时间：
2004-10
影响因子：
3.7
通讯作者：
K. Iwaya;Y. Kohsaka;S. Satow;T. Hanaguri;S. Miyasaka;H. Takagi
中科院分区：
文献类型：
--
作者：
K. Iwaya;Y. Kohsaka;S. Satow;T. Hanaguri;S. Miyasaka;H. Takagi
利用扫描隧道显微镜/光谱（STM/STS）研究了从金属一侧接近带宽控制的金属-绝缘体转变（MIT）时$\mathrm{Ni}{\mathrm {S}}_{2\ensuremath {-}x}{\mathrm{Se}}_{x}$黄铁矿中局域电子态的演化.在立方（100）表面上观察到$\mathrm {Se}闪烁\mathrm{S}$锯齿形链的原子分辨图像，并且在隧道谱中清楚地识别出费米能级附近的准粒子带变窄。与MIT的掺杂控制形成鲜明对比的是，即使在MIT附近，局部电子态也是空间均匀的。
The evolution of local electronic states in $\mathrm{Ni}{\mathrm{S}}_{2\ensuremath{-}x}{\mathrm{Se}}_{x}$ pyrite as a bandwidth-controlled metal-insulator transition (MIT) approached from the metallic side is explored by scanning tunneling microscopy/spectroscopy (STM/STS). Atomically resolved images of $\mathrm{Se}∕\mathrm{S}$ zigzag chains are observed on top of the cubic (100) surface, and a narrowing of the quasiparticle band near the Fermi level is clearly identified in tunneling spectra. In marked contrast to MIT's control by doping, the local electronic states are found to be spatially homogeneous even in the vicinity of the MIT.