Vector-substrate-based Josephson junctions

TL;DR

This paper introduces a novel vector substrate technique for fabricating high-temperature cuprate superconductor Josephson junctions without needing bulk bicrystalline substrates, enabling more versatile and scalable device manufacturing.

Contribution

It presents a new method using thin bicrystalline membranes transferred onto conventional substrates for high-Tc Josephson junction fabrication.

Findings

Successfully fabricated 24° YBa2Cu3O7-x Josephson junctions on sapphire.

The technique allows use of various substrate materials.

Enables scalable and flexible junction design.

Abstract

We present a way to We present a way to fabricate bicrystal Josephson junctions of high-Tc cuprate superconductors that does not require bulk bicrystalline substrates. Based on vector substrate technology, this novel approach makes use of a few tens-of-nanometers-thick bicrystalline membranes transferred onto conventional substrates.We demonstrate 24{\deg} YBa2Cu3O7-x Josephson junctions fabricated on sapphire single crystals by utilizing 10-nm-thick bicrystalline membranes of SrTiO3. This technique allows one to manufacture bicrystalline Josephson junctions of high-Tc superconductors on a large variety of bulk substrate materials, providing novel degrees of freedom in designing the junctions and their electronic properties. It furthermore offers the capability to replace the fabrication of bulk bicrystalline substrates with thin-film growth methods