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arXiv 0808.2638cond-mat.mtrl-sci
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CeTe3电荷密度波的扫描隧道显微镜研究

Scanning tunneling microscopy study of the CeTe3 charge density wave

A. Tomic, Zs. Rak, J. P. Veazey, S. D. Mahanti, S. H. Tessmer, C. D. Malliakas, M. G. Kanatzidis

摘要:

我们已经研究了CeTe 3的表面电荷分布的性质。这是一种简单、可分裂的层状材料,具有强大的一维无公度电荷密度波(CDW)。扫描隧道显微镜(STM)已被应用于切割的单晶的暴露表面上。在77 K时,STM图像显示了表面Te原子排列在正方形网络中的原子晶格和相对于Te网络以45度取向的CDW调制。STM数据的傅里叶变换显示Te正方形晶格峰,以及与CDW相关的峰,其取向与晶格峰成45度。此外,清晰的峰值存在,与地下结构和波矢量混合效应一致。这些数据支持电子结构的计算,这表明,表面下的信号最有可能产生的Ce原子的晶格位于2.53埃以下的表面Te网。

英文摘要:

We have studied the nature of the surface charge distribution in CeTe3. This is a simple, cleavable, layered material with a robust one-dimensional incommensurate charge density wave (CDW). Scanning tunneling microscopy (STM) has been applied on the exposed surface of a cleaved single crystal. At 77 K, the STM images show both the atomic lattice of surface Te atoms arranged in a square net and the CDW modulations oriented at 45 degrees with respect to the Te net. Fourier transform of the STM data shows Te square lattice peaks, and peaks related to the CDW oriented at 45 degrees to the lattice peaks. In addition, clear peaks are present, consistent with subsurface structure and wave vector mixing effects. These data are supported by electronic structure calculations, which show that the subsurface signal most likely arises from a lattice of Ce atoms situated 2.53 angstroms below the surface Te net.

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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