Components with Josephson contacts and methods of making the same

Abstract

Electronic assemblies having Josephson contacts and methods of manufacture are suggested. The assembly comprises a substrate (1.1) and a layer of high-temperature superconducting material (1.4) arranged on the substrate, wherein the substrate has at least one stepped edge in its surface, wherein the layer At the step edges there are grain boundaries (1.5) which constitute one or more weak links of the Josephson contacts. According to the invention, on both sides of the step edge in the level of the high-temperature superconducting layer there is a texturing of the substrate and / or at least one buffer arranged between the substrate and the high-temperature superconducting layer The texture of the layer is used to orient the a-axis and / or the b-axis perpendicular to the grain boundaries with deviations of up to 10°. This can be achieved technically, for example, by growing the HTSL layer graphically and epitaxially. Due to the fact that the same crystal axes are each oriented perpendicular to the step edge towards both sides of the step edge, the maximum supercurrent can flow through the grain boundaries induced by the step edge and thus through the Josephson contact.

Description

technical field [0001] The present invention relates to electronic assemblies having Josephson contacts and methods of manufacture. Background technique [0002] High temperature superconductivity (high T c , HTSL) Josephson contacts between electrons are the fundamental unit of superconducting electronics. They are especially used in superconducting quantum interference devices (SQUIDs) for highly sensitive magnetic field measurements and in detectors for THz radiation. [0003] An important parameter of the Josephson contact is the critical current density J of the superconducting state c and the resistance R in the normally conducting state n . These quantities, especially their product J c* R n (and / or with the critical current I c The product of I c* R n ) as a figure of merit for the applicability of Josephson contacts for the purpose given by ( )A known. This document discloses that not only the J at the grain boundaries of the YBCO HTSL layer c and R ...

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Problems solved by technology

The downside is that so far the reproducibility is only sufficient to demonstrate the feasibility of principle (proof of concept), however not sufficient for large-scale manufacturing due to the formation of very high number of rejects

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