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Paper Abstract and Keywords
Presentation 2014-01-24 09:30
Effect of quasiparticles in the intra-gap states on the property of superconducting resonators
Takashi Noguchi (NAOJ), Masato Naruse (Saitama Univ.), Masakazu Sekine (Univ. of Tokyo), Kenichi Karatsu, Yutaro Sekimoto (NAOJ) SCE2013-46
Abstract (in Japanese) (See Japanese page) 
(in English) We propose a hypothesis that there are a few numbers of quasiparticlestates inside the energy gap and analyze the surface resistance and the Q-values of a resonator of superconductor using the hypothesis. The conventional Mattis-Bardeen theory is extended by introducing the complex number of the superconducting gap energy, which well predicts the magnitude of the quasiparticle density of states inside the energy gap. Using the extended Mattis-Bardeen theory, the surface resistance of superconductors and the Q-value of superconducting resonators are calculated. It is shown that simulated temperature dependence of the surface resistance and Q-value of a superconductor agree very well with the experimental results. It is also demonstrated that the calculated residual quasiparticle number of a superconducting resonator using the density of states, which is obtained from the fitting of a dc I-V curve of SIS tunnel junction, quantitatively agrees with the measured one.
Keyword (in Japanese) (See Japanese page) 
(in English) superconductor / surface resistance / resonator / quasiparticle / density of states / / /  
Reference Info. IEICE Tech. Rep., vol. 113, no. 401, SCE2013-46, pp. 67-72, Jan. 2014.
Paper # SCE2013-46 
Date of Issue 2014-01-16 (SCE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee SCE  
Conference Date 2014-01-23 - 2014-01-24 
Place (in Japanese) (See Japanese page) 
Place (in English) Kikaishinkou-kaikan Bldg. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Thin film, device technologies and their applications, etc. 
Paper Information
Registration To SCE 
Conference Code 2014-01-SCE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Effect of quasiparticles in the intra-gap states on the property of superconducting resonators 
Sub Title (in English)  
Keyword(1) superconductor  
Keyword(2) surface resistance  
Keyword(3) resonator  
Keyword(4) quasiparticle  
Keyword(5) density of states  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Takashi Noguchi  
1st Author's Affiliation Natinal Astronomical Observatory of Japan (NAOJ)
2nd Author's Name Masato Naruse  
2nd Author's Affiliation Saitama University (Saitama Univ.)
3rd Author's Name Masakazu Sekine  
3rd Author's Affiliation University of Tokyo (Univ. of Tokyo)
4th Author's Name Kenichi Karatsu  
4th Author's Affiliation Natinal Astronomical Observatory of Japan (NAOJ)
5th Author's Name Yutaro Sekimoto  
5th Author's Affiliation Natinal Astronomical Observatory of Japan (NAOJ)
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Speaker Author-1 
Date Time 2014-01-24 09:30:00 
Presentation Time 25 minutes 
Registration for SCE 
Paper # SCE2013-46 
Volume (vol) vol.113 
Number (no) no.401 
Page pp.67-72 
#Pages 6 
Date of Issue 2014-01-16 (SCE) 

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