| Presentation | 2014-10-16 Influence of quasiparticles in the energy gap on the characteristics of superconducting devices Takashi NOGUCHI, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We propose a hypothesis that there are a few numbers of quasiparticle states 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 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 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) |
| Keyword(in English) | superconductor / surface resistance / resonator / quasiparticle / density of states |
| Paper # | SCE2014-48 |
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| Conference Information | |
| Committee | SCE |
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| Conference Date | 2014/10/8(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Superconductive Electronics (SCE) |
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| Language | JPN |
| 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 |
| 1st Author's Name | Takashi NOGUCHI |
| 1st Author's Affiliation | Advanced Technology Center, National Astronomical Observatory() |
| Date | 2014-10-16 |
| Paper # | SCE2014-48 |
| Volume (vol) | vol.114 |
| Number (no) | 247 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |