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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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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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Equipotential Surfaces and Conductors01:16

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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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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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Search for superscreening effects in a superconductor.

P Ujić1, F de Oliveira Santos, M Lewitowicz

  • 1GANIL CEA/DSM-CNRS/IN2P3, Caen, France.

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Radioactive decay measurements of Oxygen-19 and Neon-19 in niobium challenge the "superscreening" theory. The study found no significant difference in decay properties between niobium

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Area of Science:

  • Nuclear Physics
  • Condensed Matter Physics
  • Materials Science

Background:

  • The phenomenon of electron screening in metals influences nuclear reaction rates.
  • Superconducting materials are predicted to exhibit enhanced electron screening, termed 'superscreening'.
  • Experimental verification of superscreening is crucial for understanding fundamental physics in extreme conditions.

Purpose of the Study:

  • To experimentally investigate the electron screening effect in niobium during radioactive decay.
  • To compare the decay properties of Oxygen-19 and Neon-19 in both superconducting and metallic phases of niobium.
  • To test the theoretical predictions of enhanced electron screening in superconductors.

Main Methods:

  • Utilized purified radioactive beams of Oxygen-19 (β(-)) and Neon-19 (β(+)) produced at the SPIRAL GANIL facility.
  • Implanted these isotopes into niobium samples in both superconducting and metallic states.
  • Precisely measured the half-lives and branching ratios of the implanted isotopes.

Main Results:

  • Obtained precise half-life measurements: 26.476(9) s for Oxygen-19 and 17.254(5) s for Neon-19.
  • Observed no significant difference in half-lives and branching ratios between the superconducting and metallic phases of niobium within a 1σ error bar.
  • Determined the difference in screening potential energy to be 110(90) eV for Neon-19 and 400(320) eV for Oxygen-19.

Conclusions:

  • The experimental results cast significant doubt on the existence of strong "superscreening" in superconductors.
  • The findings suggest that the electron screening effect in niobium does not differ substantially between its superconducting and metallic phases.
  • This study provides crucial experimental data that challenges established theoretical models of electron screening in condensed matter.