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| Presentation | 2014-10-16 14:10 [Invited Talk] Influence of quasiparticles in the energy gap on the characteristics of superconducting devices Takashi Noguchi (NAOJ)  SCE2014-48 Link to ES Tech. Rep. Archives: SCE2014-48 |
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| 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 factors 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 predictsthe 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 factor of superconducting resonators are calculated. It is shown that simulated temperature dependence of the surface resistance and Q factor 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. 114, no. 247, SCE2014-48, pp. 75-80, Oct. 2014. | |
| Paper # | SCE2014-48 | |
| Date of Issue | 2014-10-08 (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) | |
| Download PDF | SCE2014-48 Link to ES Tech. Rep. Archives: SCE2014-48 |
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| Conference Information | |
| Committee | SCE |
| Conference Date | 2014-10-15 - 2014-10-16 |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Tohoku University, RIEC |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Superconducting sensing technologies and their applications, etc. |
| Paper Information | |
| Registration To | SCE |
| Conference Code | 2014-10-SCE |
| Language | Japanese |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Influence of quasiparticles in the energy gap on the characteristics of superconducting devices |
| 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 | National Astronomical Observatory (NAOJ) |
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| Speaker | Author-1 |
| Date Time | 2014-10-16 14:10:00 |
| Presentation Time | 40 minutes |
| Registration for | SCE |
| Paper # | SCE2014-48 |
| Volume (vol) | vol.114 |
| Number (no) | no.247 |
| Page | pp.75-80 |
| #Pages | 6 |
| Date of Issue | 2014-10-08 (SCE) |
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