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ID 46731
本文ファイル
著者
Sugimoto, A. 大学院総合科学研究科 広大研究者総覧
Shohara, K.
Ekino, T.
Watanabe, Y.
Harada, Y.
Mikusu, S.
Tokiwa, K.
Watanabe, T.
キーワード
Ba2Ca5Cu6O12 (O 1-xF x)2
F0256
STM
tunneling spectroscopy
NDC
物理学
抄録(英)
Scanning tunneling microscopy/spectroscopy (STM/STS) measurements on multi-layered cuprate superconductor Ba2Ca5Cu6O12 (O 1-x Fx)2 are carried out. STM topographies show randomly distributed bright spot structures with a typical spot size of ~ 0.8 nm. These bright spots are occupied about 28% per one unit cell of c-plane, which is comparable to the regular amount of apical oxygen of 20% obtained from element analysis. Tunneling spectra simultaneously show both the small and the large gap structures. These gap sizes at 4.9 K are about Δ ~ 15 meV and ~ 90 meV, respectively. The small gap structure disappears at the temperature close to TC, while the large gap persists up to ~200 K. Therefore, these features correspond to the superconducting gap and pseudogap, respectively. These facts give evidence for some ordered state with large energy scale even in the superconducting state. For the superconducting gap, the ratio of 2ΔS /KBTC = 4.9 is obtained with TC = 70 K, which is determined from temperature dependence of the tunneling spectra.
内容記述
This research was supported by Grant-in-Aid for Scientific Research (No. 19540370) from JSPS, Japan.
掲載誌名
Physica C: Superconductivity
469巻
15-20号
開始ページ
1020
終了ページ
1023
出版年月日
2009-10-15
出版者
Elsevier B.V.
ISSN
0921-4534
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
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application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2009. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
関連情報URL
部局名
総合科学研究科