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
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| File | |
| Title ( eng ) |
Scanning Tunneling Spectroscopy and Break Junction Spectroscopy on Iron-Oxypnictide Superconductor NdFeAs(O0.9 F0.1)
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| Creator |
Ekino T.
Ukita R.
Shohara K.
Okabe H.
Akimitsu J.
Gabovich A.M.
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| Source Title |
Physica C: Superconductivity and its Applications
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| 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.
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| Keywords |
Iron-pnictide superconductor
STM
tunneling spectroscopy
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| 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).
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| NDC |
Physics [ 420 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Elsevier B.V.
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| 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。
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| 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
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