Nanoscale modulation of local barrier height on Bi-based cuprate superconductors observed by scanning tunneling microscopy/spectroscopy

被引：22

作者：

Sugimoto, Akira ^{[1
]}

Ekino, Toshikazu ^{[1
]}

Eisaki, Hiroshi ^{[2
]}

机构：

[1] Hiroshima Univ, Grad Sch Integrated Arts & Sci, Hiroshima 7398521, Japan

[2] Natl Inst Adv Ind Sci & Technol, Nanoelect Res Inst, Tsukuba, Ibaraki 3058568, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷 / 04期

关键词：

STM; STS; Bi2212; local barrier height; workfunction; inhomogeneous superconductor; supermodulation;

D O I：

10.1143/JPSJ.77.043705

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The atomically resolved local barrier height (LBH) of a Bi2Sr2CaCu2O8+delta (Bi2212) superconducting single crystal is investigated by using scanning tunneling microscopy/ spectroscopy (STM/STS). The LBH distribution is found to be strongly related with the well-known supermodulation structure of the Bi2212 surface with a period of similar to 2.7 nm. In particular, the magnitude of the LBH is anticorrelated to the Bi-Bi atomic distance that is affected by supermodulation. A comparison with simultaneously obtained conductance spectra shows that there is a small correlation between the spatial modulation of the gap amplitude (A) and the LBH, this indicates that the measured A is slightly affected by the topmost BiO surface, but dominantly reflects information on the inner CuO2 layer, which is responsible for the superconductivity.

引用

页数：4

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