Nanoscale Modulation of Local Barrier Height on Bi-based Cuprate Superconductors Observed by Scanning Tunneling Microscopy/Spectroscopy(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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The atomically resolved local barrier height (LBH) of a Bi_2Sr_2CaCu_2O_<8+δ> (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 〜2.7nm. 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 (Δ) and the LBH, this indicates that the measured Δ is slightly affected by the topmost BiO surface, but dominantly reflects information on the inner CuO_2 layer, which is responsible for the superconductivity.
- 社団法人日本物理学会の論文
- 2008-04-15
著者
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EISAKI Hiroshi
Nanoelectronics Research Institute (NeRI), AIST
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EISAKI Hiroshi
National Institute of Advanced Industrial Science and Technology
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Eisaki Hiroshi
Nanoelectronics Research Institute (neri) National Institute Of Advanced Industrial Science And Tech
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Eisaki Hiroshi
Nanoelectronics Research Institute National Institute Of Advanced Industrial Science And Technology
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SUGIMOTO Akira
Graduate School of Integrated Arts and Sciences, Hiroshima University
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EKINO Toshikazu
Graduate School of Integrated Arts and Sciences, Hiroshima University
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Ekino Toshikazu
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Sugimoto Akira
Graduate School Of Integrated Arts And Sciences Hiroshima University
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Ekino Toshikazu
Graduate School of Advanced Sciences of Matter, Hiroshima University:Faculty of Integrated Arts and Sciences, Hiroshima University
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