Ramp type HTS Josephson junctions with PrBaCuGaO barriers

Verhoeven, M.A.J.; Gerritsma, G.J.; Rogalla, Horst; Golubov, Alexandre Avraamovitch

doi:10.1109/77.402996

Cited by 50 publications

(29 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…8 We have fabricated and characterized a planar type junction made of two YBCO electrodes with a linking PBCO layer underneath ͑Fig. 7͒.…”

Section: B Pbco Planar Junctionsmentioning

confidence: 99%

“…A suggested explanation for these unusually long coherence lengths is that the Cooper pairs tunnel through bound localized states in PBCO. On the other hand, J. Verhoeven et al 8 have estimated the coherence lengths in the a-, b-axis directions to be about 2 nm ͑4.2 K͒ in ramp-edge type of junctions. We have fabricated a planar type of YBCO/PBCO/ YBCO device and evaluated its transport properties.…”

Section: Introductionmentioning

confidence: 97%

See 1 more Smart Citation

Fabrication and transport measurements of YBa2Cu3O7−x nanostructures

Larsson

Nilsson

Ivanov

2000

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

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.

show abstract

“…8 We have fabricated and characterized a planar type junction made of two YBCO electrodes with a linking PBCO layer underneath ͑Fig. 7͒.…”

Section: B Pbco Planar Junctionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Fabrication and transport measurements of YBa2Cu3O7−x nanostructures

Larsson

Nilsson

Ivanov

2000

Journal of Vacuum Science &Amp; Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena

View full text Add to dashboard Cite

show abstract

“…Thus, we used the relatively low deposition temperature of 700-720 C for the PBCGO barrier layers. The fabrication process of our junctions was described previously [8]. Starting from a sputtered DBCO/PBCGO ( ) bilayer, a ramp with an angle of 20 with respect to the substrate surface was etched using an Ar-ion beam.…”

Section: Methodsmentioning

confidence: 99%

“…Microwaves (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) GHz) and millimeter waves (101 GHz) were generated by a synthesized signal generator and a Gunn diode and were fed to ramp-type junctions using a coaxial cable and a waveguide, respectively. Terahertz wave signals were generated by a farinfrared (FIR) laser, pumped by a 38-W CO laser, yielding 40 mW on the 761.7-GHz formic acid line, 100 mW on the 1.40-THz diflorometan line, and 120 mW on the 2.52-THz methanol line.…”

Section: Methodsmentioning

confidence: 99%