Réalisation et étude de circuits submicroniques supraconducteurs: disque supraconducteur et courants critiques

Abstract : Two-dimensional superconducting arrays were studied. Their measured properties such as the critical temperature versus magnetic field Tc(H), the critical current, the magnetization inform on the energy spectrum of a quantum particle in the two-dimensional structure.
These circuits were realized by e-beam lithography using a two resist layer PMMA/MAA. By the optimisation of this process we succeed to obtain 100nm-width superconducting wire.
We have studied for the first time the properties of a superconducting disk. Critical temperature and magnetization were measured versus magnetic field. This experimental results were perfectly explained by a theoretical model based on a charge quantum particle confined in a disk in presence of a magnetic field.
We have also measured the critical current in square superconducting arrays. The agreement is good with the depairing current derived by a simple theoretical model using the energy spectrum of the network.
The dissipative regime inside these two dimensional arrays were studied and a regime equivalent to the flux flow regime was obersevd.
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Theses
Physics [physics]. Université Joseph-Fourier - Grenoble I, 1990. French


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Submitted on : Wednesday, April 15, 2009 - 5:45:43 PM
Last modification on : Monday, April 27, 2015 - 4:04:10 PM

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Olivier Buisson. Réalisation et étude de circuits submicroniques supraconducteurs: disque supraconducteur et courants critiques. Physics [physics]. Université Joseph-Fourier - Grenoble I, 1990. French. <tel-00375687>

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