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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
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Oxide-based platform for reconfigurable superconducting nanoelectronics.

Joshua P Veazey1, Guanglei Cheng, Patrick Irvin

  • 1Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA.

Nanotechnology
|August 23, 2013
PubMed
Summary
This summary is machine-generated.

Researchers created quasi-1D superconductivity in LaAlO3/SrTiO3 nanostructures. This breakthrough offers a new platform for developing tunable superconducting nanoelectronic devices.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • The LaAlO3/SrTiO3 interface hosts a two-dimensional electron liquid (2DEL) with tunable electronic properties.
  • Exploring superconductivity in reduced dimensions is crucial for understanding fundamental physics and developing novel electronic devices.

Purpose of the Study:

  • To investigate quasi-one-dimensional (quasi-1D) superconductivity at the LaAlO3/SrTiO3 interface.
  • To develop a method for fabricating tunable superconducting nanostructures for nanoelectronics.

Main Methods:

  • Fabrication of nanostructures with widths ~10 nm using conductive atomic force microscope (c-AFM) lithography.
  • Characterization of superconducting properties, including resistance-temperature transitions and current-voltage (V-I) characteristics.
  • Gate-tuning of superconducting properties using a back gate.

Main Results:

  • Observation of quasi-1D superconductivity in nanostructures with dimensions smaller than the superconducting coherence length.
  • Broad superconducting transitions and finite resistance below the critical temperature (Tc ≈ 200 mK), attributed to fluctuations and heating effects.
  • Gate-tunability of superconducting resistance and V-I characteristics.
  • Unusual current path dependence of four-terminal resistance.

Conclusions:

  • The developed c-AFM lithography technique enables the creation of gate-tunable superconducting nanostructures on the LaAlO3/SrTiO3 system.
  • This work establishes a new platform for reconfigurable superconducting nanoelectronics.
  • The findings open avenues for designing novel superconducting devices with tailored properties.