Related Experiment Video
Updated: Jun 1, 2026
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
Soft nanostructuring of YBCO Josephson junctions by phase separation
D Gustafsson1, H Pettersson, B Iandolo
1Department of Microtechnology and Nanoscience, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
Nano Letters
|November 18, 2010
Summary
We developed a new nanoscale fabrication method for YBao2 Cu3 O7-δ (YBCO) Josephson junctions. This technique avoids interface damage and allows for precise control over junction properties.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Superconductivity
Background:
- Fabricating nanoscale Josephson junctions is crucial for advanced superconducting electronics.
- Conventional methods often damage the critical grain boundary interfaces in YBa2 Cu3 O7-δ (YBCO) materials.
- Understanding intrinsic grain boundary properties is essential for improving device performance.
Purpose of the Study:
- To develop a novel method for fabricating nanoscale biepitaxial YBCO Josephson junctions.
- To achieve junction widths down to 100 nm while preserving interface integrity.
- To enable the study of intrinsic grain boundary properties in YBCO.
Main Methods:
- Utilizing the phase competition between superconducting YBa2 Cu3 O7-δ and insulating Y2 BaCuO5 during film growth.
- Forming nanometer-sized grain boundary junctions within an insulating Y2 BaCuO5 matrix.
- Employing high-resolution transmission electron microscopy (HRTEM) for structural confirmation.
Main Results:
- Successfully fabricated nanoscale biepitaxial YBCO Josephson junctions with widths down to 100 nm.
- Demonstrated a fabrication method that avoids conventional patterning-induced damage at grain boundary interfaces.
- Observed clear indications from electrical transport measurements that intrinsic grain boundary properties are being probed.
Conclusions:
- The developed method offers a pathway to high-quality nanoscale YBCO Josephson junctions.
- This technique minimizes interface degradation, paving the way for more reliable superconducting devices.
- The results suggest the potential for investigating fundamental physics at YBCO grain boundaries.
More Related Videos
06:49Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
Published on: April 12, 2019
09:06Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Related Concept Videos
02:31Phase Transitions
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
01:27Electrostatic Boundary Conditions in Dielectrics
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity.
01:16Biasing of P-N Junction
The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:21Phase Transitions
A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...