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Related Concept Videos

Superconductor01:24

Superconductor

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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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Types Of Superconductors01:28

Types Of Superconductors

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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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Enhanced critical current density in optimized high-temperature superconducting bilayer thin films.

E Rivasto1, M M Aye1,2, H Huhtinen1

  • 1Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 15, 2023
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Summary

Bilayer superconducting films of Yttrium Barium Copper Oxide (YBCO) and Barium Zirconate (BZO) show enhanced performance. Optimal structures significantly outperform single layers, making them promising for next-generation coated conductors.

Keywords:
bilayercritical current densityhigh-temperature superconductivitymultilayerthin filmvortex pinning

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • High-temperature superconductors like Yttrium Barium Copper Oxide (YBCO) are crucial for advanced applications.
  • Improving the performance of superconducting films is an ongoing challenge.
  • Incorporating additives like Barium Zirconate (BZO) can modify material properties.

Purpose of the Study:

  • To investigate the superconducting and structural properties of YBCO/YBCO+BZO bilayer thin films.
  • To determine the optimal composition and structure for enhanced critical current density.
  • To evaluate the potential of these bilayer films for next-generation coated conductors.

Main Methods:

  • Fabrication of YBCO/YBCO+BZO bilayer thin films.
  • Characterization of structural and superconducting properties under varying magnetic fields and temperatures.
  • Comparison of bilayer film performance against single-layer films.

Main Results:

  • An optimal bilayer structure was identified with 30% YBCO at the interface and 70% YBCO+6%BZO on top.
  • The optimal bilayer films demonstrated a critical current density improvement of up to 60% compared to single-layer films.
  • The findings align with established theoretical frameworks for superconducting heterostructures.

Conclusions:

  • Bilayer engineering offers an effective method to enhance the performance of high-temperature superconductors.
  • The developed bilayer films present a viable and practical solution for increasing the applicability of superconductors.
  • These bilayer films are strong candidates for future coated conductor technologies.