1/f frequency fluctuations due to kinetic inductance in CoSi$_2$ microwave cavities
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916158368645120 |
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| author | Zeng, Weijun Lilja, Ilari Mukhanova, Ekaterina Heredia, Elica Wu, Chun-Wei Lin, Juhn-Jong Yeh, Sheng-Shiuan Hakonen, Pertti |
| author_facet | Zeng, Weijun Lilja, Ilari Mukhanova, Ekaterina Heredia, Elica Wu, Chun-Wei Lin, Juhn-Jong Yeh, Sheng-Shiuan Hakonen, Pertti |
| contents | Cobalt disilicide provides a promising nearly-epitaxial superconducting material on silicon, which is compatible with high-density integrated circuit technology. We have characterized CoSi$_{2}$ superconducting microwave cavities around 5.5 GHz for resonance frequency fluctuations at temperatures 10 - 200 mK. We found relatively weak fluctuations $(δf/f)^2$ following the spectral density $A/f^γ $, with $A \simeq 6 \times 10^{-16}$ and $γ$ slightly below 1 at an average number of photons of $10^4$; the noise decreased with measurement power as $1/P^{1/2}$. We identify the noise as arising from kinetic inductance fluctuations and discuss possible origins of such fluctuations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_08347 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | 1/f frequency fluctuations due to kinetic inductance in CoSi$_2$ microwave cavities Zeng, Weijun Lilja, Ilari Mukhanova, Ekaterina Heredia, Elica Wu, Chun-Wei Lin, Juhn-Jong Yeh, Sheng-Shiuan Hakonen, Pertti Superconductivity Mesoscale and Nanoscale Physics Cobalt disilicide provides a promising nearly-epitaxial superconducting material on silicon, which is compatible with high-density integrated circuit technology. We have characterized CoSi$_{2}$ superconducting microwave cavities around 5.5 GHz for resonance frequency fluctuations at temperatures 10 - 200 mK. We found relatively weak fluctuations $(δf/f)^2$ following the spectral density $A/f^γ $, with $A \simeq 6 \times 10^{-16}$ and $γ$ slightly below 1 at an average number of photons of $10^4$; the noise decreased with measurement power as $1/P^{1/2}$. We identify the noise as arising from kinetic inductance fluctuations and discuss possible origins of such fluctuations. |
| title | 1/f frequency fluctuations due to kinetic inductance in CoSi$_2$ microwave cavities |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.08347 |