Fabrication and transport measurements of YBa2Cu3O7−x nanostructures
Artikel i vetenskaplig tidskrift, 2000

We have developed a process to fabricate nanostructures in oxide materials, especially YBa2Cu3O7−x (YBCO) thin films. The fabrication process is based on a multilayer mask with an amorphous carbon layer as a key component. Electron-beam lithography, reactive ion etching, and ion-beam etching have been the supporting techniques for the process. Nanobridges ranging in width from 50 to 170 nm have been fabricated and characterized. The initial YBCO film was 50 nm thick and had a Tc of 86 K. Tc of the fabricated bridges decreased about 3–5 K with respect to the initial film. The level of the critical current density was 4–9×105 A/cm2 at 77 K and 1.6–2×107 A/cm2 at 4.2 K. No increase of the critical current density was observed as the cross-section area became smaller. The process has also been applied to fabricate 30–50 nm wide trenches in a-axis-oriented YBCO on top of a similar-oriented PrBa2Cu3O7−x (PBCO) layer. No supercurrent was observed in such junctions. The current transport was governed by Mott variable range hopping.

sputter etching

barium compounds

nanotechnology

electron beam lithography

yttrium compounds

penetration depth (superconductivity)

critical current density (superconductivity)

superconducting microbridges

coherence length

high-temperature superconductors

flux flow

superconducting thin films

Författare

Peter Larsson

Institutionen för mikroelektronik och nanovetenskap

Bengt Nilsson

Institutionen för mikroelektronik och nanovetenskap

Zdravko Ivanov

Institutionen för mikroelektronik och nanovetenskap

Journal of Vacuum Science & Technology B: Microelectronics Processing and Phenomena

0734-211X (ISSN)

Vol. 18 1825-31

Styrkeområden

Nanovetenskap och nanoteknik

Materialvetenskap

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1116/1.591145