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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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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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Possible light-induced superconductivity in K3C60 at high temperature.

M Mitrano1, A Cantaluppi1,2, D Nicoletti1,2

  • 1Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany.

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|February 9, 2016
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Summary
This summary is machine-generated.

Researchers induced superconducting-like properties in K3C60 using optical pulses. This non-equilibrium state shows increased carrier mobility and a conductivity gap, mimicking equilibrium superconductivity below 20 Kelvin.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Quantum phenomena

Background:

  • Controlling emergent phenomena in solids, like optical superconductivity enhancement, is a key research area.
  • Previous studies observed superconducting-like optical properties in copper oxides via phonon excitation, but explanations were incomplete.

Purpose of the Study:

  • To investigate non-equilibrium phenomena in a different material system, K3C60.
  • To explore the effects of optical excitation on the electronic properties of metallic K3C60.

Main Methods:

  • Utilizing mid-infrared optical pulses to excite metallic K3C60.
  • Analyzing changes in carrier mobility and optical conductivity.
  • Comparing non-equilibrium optical responses with equilibrium superconducting properties.

Main Results:

  • Optical excitation of K3C60 resulted in a significant increase in carrier mobility.
  • A notable opening of a gap in the optical conductivity was observed.
  • These non-equilibrium signatures mirrored those seen at equilibrium below the superconducting transition temperature (Tc) of 20 Kelvin.

Conclusions:

  • Non-equilibrium optical excitation of K3C60 induces properties similar to superconductivity.
  • The observed phenomena, including increased mobility and a conductivity gap, align with equilibrium superconducting states.
  • While optical methods alone are not definitive, non-equilibrium high-temperature superconductivity is proposed as a potential explanation.