Kinetic inductance in superconducting CoSi2 coplanar microwave transmission lines
Source abstract
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.
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Research context
OpenAlex topics: Superconducting and THz Device Technology · Quantum and electron transport phenomena · Physics of Superconductivity and Magnetism
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Low Temperature Laboratory, Department of Applied Physics, Aalto University 1 , P.O. Box 15100, FI-00076 Espoo, Finland
QTF Centre of Excellence, Department of Applied Physics, Aalto University 2 , P.O. Box 15100, FI-00076 Aalto, Finland
International College of Semiconductor Technology, National Yang Ming Chiao Tung University 3 , Hsinchu 30010, Taiwan
Department of Electrophysics, National Yang Ming Chiao Tung University 4 , Hsinchu 30010, Taiwan
Center for Emergent Functional Matter Science, National Yang Ming Chiao Tung University 5 , Hsinchu 30010, Taiwan
Funding
Research Council of Finland · Horizon 2020 Framework Programme · Aalto-Yliopisto · National Science and Technology Council
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