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Related Concept Videos

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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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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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Size-Dependent Superconducting Properties of In Nanowire Arrays.

Alexey A Noyan1,2, Yevgeniy A Ovchenkov2, Valery V Ryazanov3,4

  • 1Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Russia.

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Superconducting indium nanowires exhibit unique magnetic properties dependent on diameter. Thinner nanowires show enhanced critical fields, exceeding bulk values significantly.

Keywords:
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Superconducting nanowires possess distinct properties compared to bulk materials.
  • Vortex configurations in magnetic fields are diameter-dependent in superconducting nanowires.

Purpose of the Study:

  • To investigate the magnetic properties of superconducting indium (In) nanowire arrays.
  • To explore the influence of nanowire diameter on superconductivity and critical fields.

Main Methods:

  • Fabrication of parallel In nanowire arrays (45 nm, 200 nm, 550 nm) via templated electrodeposition.
  • Measurement of magnetic moment (M) versus magnetic field (H) and temperature (T) in axial and transverse fields.

Main Results:

  • Reversible M(H) curves for 45 nm and 200 nm nanowires; distinct features and hysteresis in 550 nm nanowires.
  • Critical fields increase with decreasing diameter, with the thinnest exceeding bulk values by 20 times.
  • Superconductivity observed above bulk critical temperature in In nanowires.

Conclusions:

  • Nanowire diameter critically influences magnetic field configurations and superconducting behavior.
  • Indium nanowires demonstrate enhanced superconducting properties compared to bulk indium.
  • These findings are relevant for novel nanoelectronic device development.