Scanning Tunneling Spectroscopy and Break Junction Spectroscopy on Iron-Oxypnictide Superconductor NdFeAs(O0.9 F0.1)
Physica C: Superconductivity and its Applications Volume 470 Issue 20
Page 1070-1072
published_at 2010-10-01
アクセス数 : 656 件
ダウンロード数 : 238 件
今月のアクセス数 : 0 件
今月のダウンロード数 : 0 件
この文献の参照には次のURLをご利用ください : https://ir.lib.hiroshima-u.ac.jp/00046729
File |
PhysicaC_470_1070.pdf
316 KB
種類 :
fulltext
|
Title ( eng ) |
Scanning Tunneling Spectroscopy and Break Junction Spectroscopy on Iron-Oxypnictide Superconductor NdFeAs(O0.9 F0.1)
|
Creator |
Ekino T.
Ukita R.
Shohara K.
Okabe H.
Akimitsu J.
Gabovich A.M.
|
Source Title |
Physica C: Superconductivity and its Applications
|
Volume | 470 |
Issue | 20 |
Start Page | 1070 |
End Page | 1072 |
Abstract |
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.
|
Keywords |
Iron-pnictide superconductor
STM
tunneling spectroscopy
|
Descriptions |
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).
|
NDC |
Physics [ 420 ]
|
Language |
eng
|
Resource Type | journal article |
Publisher |
Elsevier B.V.
|
Date of Issued | 2010-10-01 |
Rights |
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。
|
Publish Type | Author’s Original |
Access Rights | open access |
Source Identifier |
[ISSN] 0921-4534
[NCID] AA11461984
[DOI] 10.1016/j.physc.2010.05.038
[DOI] https://doi.org/10.1016/j.physc.2010.05.038
|