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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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Quantum fluctuations in percolating superconductors: an evolution with effective dimensionality.

Amol Nande1, Shawn Fostner1, Jack Grigg1

  • 1The MacDiarmid Institute for Advanced Materials and Nanotechnology, Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.

Nanotechnology
|February 7, 2017
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Summary
This summary is machine-generated.

We studied superconducting nanoparticle films and found their state (superconducting, metallic, or insulating) changes with nanoparticle coverage. This transition is linked to system dimensionality, affecting physics like vortices, phase slips, and tunneling.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Percolating superconducting nanoparticle films exhibit complex electronic properties.
  • Understanding the dimensionality dependence of these properties is crucial for novel electronic applications.

Purpose of the Study:

  • To investigate the electronic state evolution in percolating superconducting nanoparticle films.
  • To correlate observed electronic states with changes in system dimensionality.
  • To map the phase diagram of these states under varying conditions.

Main Methods:

  • Fabrication and characterization of superconducting nanoparticle films with controlled surface coverage.
  • Electrical transport measurements as a function of temperature and applied current.
  • Analysis of dimensionality effects (2D, 1D, 0D) on electronic properties.

Main Results:

  • Observed a transition from superconducting to metallic to insulating states with decreased nanoparticle surface coverage.
  • Demonstrated a correlation between electronic state evolution and reduction in system dimensionality (2D to 1D to 0D).
  • Identified dominant physical mechanisms in each regime: vortices (2D), phase slips (1D), and tunneling (0D).

Conclusions:

  • The electronic behavior of superconducting nanoparticle films is strongly dependent on dimensionality.
  • Phase diagrams can effectively map the superconducting, metallic, and insulating states based on surface coverage, temperature, and current.
  • This work provides fundamental insights into electron transport in disordered nanoscale systems.