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ID 46729
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
Ekino, T.
Ukita, R.
Shohara, K.
Okabe, H.
Akimitsu, J.
Gabovich, A.M.
キーワード
Iron-pnictide superconductor
STM
tunneling spectroscopy
NDC
物理学
抄録(英)
Iron-oxypnictide superconductor NdFeAs(O0.9F0.1) was studied using both low-temperature scanning tunneling microscopy/spectroscopy (STM/STS) and tunnel break junction (BJ) methods. STM topography showed granular and spot structures with a typical size of several nanometers, most probably governed by fluorine atom distribution. The majority of STS conductance, G, versus voltage, V, curves revealed V-shaped structures, whereas some of G(V) dependences possessed coherent gap peaks or kinks at gap energies. At the same time, G(V) dependences obtained by the BJ technique showed clear-cut coherence peaks with peak-to-peak distances Vpp = 4 Δ/e ~ 25 mV at 4.2 K, where Δ is the superconducting energy gap, e > 0 is the elementary charge. This yields Δ (0) = 6~7 meV, so that the ratio 2Δ(0)/kBTc is about 3~4, kB being the Boltzmann constant. This value is consistent with the conventional weak-coupling s-wave Bardeen-Cooper-Schrieffer theory.
内容記述
This research was supported by Grant-in-Aid for Scientific Research (No. 19540370) from JSPS, Japan. AMG highly appreciates the 2009 Visitors Program of the Max Planck Institute for the Physics of Complex Systems (Dresden, Germany).
掲載誌名
Physica C: Superconductivity and its Applications
470巻
20号
開始ページ
1070
終了ページ
1072
出版年月日
2010-10-01
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
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2010. 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