Granular superconductors for high kinetic inductance and low loss quantum devices
arXiv:2008.02860 · doi:10.1063/5.0017749
Abstract
Granular aluminum is a promising material for high kinetic inductance devices such as qubit circuits. It has the advantage over atomically disordered materials such as NbN_x, to maintain a high kinetic inductance concomitantly with a high quality factor. We show that high quality nano-scale granular aluminum films having a sharp superconducting transition with normal state resistivity values of the order of 1x10^5 μΩcm and kinetic inductance values of the order of 10 nH/sq can be obtained, surpassing state of the art values. We argue that this is a result of the different nature of the metal-to-insulator transition, being electronic correlations driven (Mott type) in the former and disorder driven (Anderson type) in the latter.
arXiv commentThe following article has been accepted by Applied Physics Letters. After it is published, it will be found at http://apl.aip.org/
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