Projects per year
Abstract
We have looked into cobalt disilicide (CoSi2) as a potential building block for superconducting quantum circuits. In order to achieve this, we annealed a thin layer of Co to create microwave cavities with thickness of d = 10-105 nm from CoSi2 embedded in the silicon substrate. The cavity properties were measured as a function of temperature and power. In the films measuring 10 and 25 nm, we find a significant kinetic inductance LK with a non-BCS power-law variation δLK ∝ T4.3±0.2 at low temperatures. The quality factor of the studied microwave resonances varied from 3 × 103 (d = 10 nm) to ∼5 × 104 (d = 105 nm) and increased as d(A − log d) with thickness, with two-level systems having very little effect. The power dependence of kinetic inductance was analyzed in terms of heat flow due to electron-phonon coupling, which was found to be stronger than estimated for heat relaxation by regular quasiparticles.
Original language | English |
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Article number | 041115 |
Pages (from-to) | 1-7 |
Number of pages | 7 |
Journal | APL Materials |
Volume | 12 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2024 |
MoE publication type | A1 Journal article-refereed |
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EFT: Topologically induced frustration and quantum phenomena
Hakonen, P. (Principal investigator), Haque, M. (Project Member), Lilja, I. (Project Member), Sergeicheva, E. (Project Member) & Todoshchenko, I. (Project Member)
01/09/2021 → 31/08/2025
Project: Academy of Finland: Other research funding
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AoF_Mobility_Yeh: AoF Mobility Hakonen/Yeh/Taiwan-Finland / Critical current fluctuations in graphene and graphene-related Josephson Junctions
Hakonen, P. (Principal investigator)
10/02/2021 → 31/10/2024
Project: Academy of Finland: Other research funding
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-: European Microkelvin Platform
Hakonen, P. (Principal investigator)
01/01/2019 → 31/12/2023
Project: EU: Framework programmes funding
Equipment
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OtaNano – Low Temperature Laboratory
Savin, A. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility