arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.00898cond-mat.supr-con
收藏

Pt掺杂对Ir_{1-x} Pt_{x} Te_{2}表面和电子结构的影响

Visualizing the Pt doping effect on surface and electronic structure in Ir_{1-x}Pt_{x}Te_{2} by scanning tunneling microscopy and spectroscopy

Y. Fujisawa, T. Machida, K. Igarashi, A. Kaneko, T. Mochiku, S. Ooi, M. Tachiki, K. Komori, K. Hirata, H. Sakata

摘要:

利用扫描隧道显微镜(STM)和能谱(STS)研究了Pt掺杂对Ir $_{\mathrm{1-x}}$ Pt $_{\mathrm{x}}$ Te $_ {\mathrm{2}}$的表面和电子结构的影响。通过在4.2 K下裂解制备的表面示出了最顶端的Te原子的三角形晶格。经历结构转变的化合物具有固定波矢$q = \frac{2π}{5a_m}$的超调制(其中$a_m$是单斜相的晶格常数),尽管Pt浓度不同。超导化合物呈片状结构。既不表现出超导电性也不表现出结构转变的化合物的表面不显示超结构。在所有掺杂样品中,掺杂剂在STM图像中观察到为暗点。掺杂剂附近的隧穿光谱显示了在约-200 mV处的局域态密度的变化。掺杂剂的这种微观效应为我们建立这种材料的微观模型提供了关键。

英文摘要:

We report on the Pt doping effect on surface and electronic structure in Ir$_{\mathrm{1-x}}$Pt$_{\mathrm{x}}$Te$_ {\mathrm{2}}$ by scanning tunneling microscopy (STM) and spectroscopy (STS). The surface prepared by cleavage at 4.2 K shows a triangular lattice of topmost Te atoms. The compounds that undergo structural transition have supermodulation with a fixed wave vector $q = \frac{2π}{5a_m}$ (where $a_m$ is the lattice constant in the monoclinic phase) despite the different Pt concentrations. The superconducting compounds show patch structures. The surface of the compound that exhibits neither the superconductivity nor the structural transition shows no superstructure. In all doped samples, the dopant is observed as a dark spot in STM images. The tunneling spectra near the dopant show the change in the local density of state at approximately -200 mV. Such microscopic effects of the dopant give us the keys for establishing a microscopic model of this material.

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。

↑