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arXiv 0801.3421cond-mat.supr-concond-mat.str-el
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控制YBa2C3O7-d极性表面的自掺杂:用ARPES从费米面到节点费米弧

Controlling the self-doping of YBa2C3O7-d polar surfaces: From Fermi surface to nodal Fermi arcs by ARPES

M. A. Hossain, J. D. F. Mottershead, A. Bostwick, J. L. McChesney, E. Rotenberg, R. Liang, W. N. Hardy, G. A. Sawatzky, I. S. Elfimov, D. A. Bonn, A. Damascelli

摘要:

YBa_2Cu_3 O_(6.5)正常态电阻率量子振荡的发现首次证明了欠掺杂铜酸盐中费米面(FS)口袋的存在。然而,口袋的电子与空穴的字符,并在封闭FS轮廓的解释,是相当大的辩论的主题。角分辨光电子能谱(ARPES)具有探测电子色散和FS的能力,非常适合解决这个问题。遗憾的是,YBa_2C_3O_(7-d)(YBCO)的ARPES研究受到技术表面灵敏度的限制。在这里,我们表明,这源于极性和相应的自掺杂的YBCO表面。通过在解理表面上原位沉积钾原子,我们能够连续地将单个样品的掺杂从重度过掺杂调整到欠掺杂状态。这揭示了在欠掺杂的YBCO 6.5中,正常金属样FS逐渐崩溃成四个断开的节FS弧,或者可能进入空穴而不是电子口袋。

英文摘要:

The discovery of quantum oscillations in the normal-state electrical resistivity of YBa2Cu3O6.5 provides the first evidence for the existence of Fermi surface (FS) pockets in an underdoped cuprate. However, the pockets' electron vs. hole character, and the very interpretation in terms of closed FS contours, are the subject of considerable debate. Angle-resolved photoemission spectroscopy (ARPES), with its ability to probe electronic dispersion as well as the FS, is ideally suited to address this issue. Unfortunately, the ARPES study of YBa2C3O7-d (YBCO) has been hampered by the technique's surface sensitivity. Here we show that this stems from the polarity and corresponding self-doping of the YBCO surface. By in-situ deposition of potassium atoms on the cleaved surface, we are able to continuously tune the doping of a single sample from the heavily overdoped to the underdoped regime. This reveals the progressive collapse of the normal-metal-like FS into four disconnected nodal FS arcs, or perhaps into hole but not electron pockets, in underdoped YBCO6.5.

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