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Superconductivity

Superconductivity. Michael Spreitzer. „Superconductivity“ ? Who discovered it ? Meissner & Ochsenknecht effect? BCS – Theory Different types of superconductivity Applications. Overview. Z ero resistance Expulsion of magnetic field lines. Superconductivity.

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Superconductivity

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  1. Superconductivity Michael Spreitzer

  2. „Superconductivity“ ? • Who discovered it ? • Meissner & Ochsenknecht effect? • BCS – Theory • Different types of superconductivity • Applications Overview

  3. Zero resistance • Expulsion of magnetic field lines Superconductivity

  4. Electrical resistance drops to zero • Materals with a ct arround 120 K can be cooled down with liquid nitrogen (77K) Critical temperature

  5. 1853-1926 • Dutch physicist • Liquified He 1908 (4K) • 1911 Heike Kamerlingh Onnes

  6. pushes out magentic field lines -and keep them out This „diamagnetic“ property is more fundermental than zero resistance Meissner- Ochsenknecht Effect

  7. John Bardeen Leon Cooper John Schrieffer Nobel Prize 1972 for theory from 1957 which explained conventional superconductors BCS - Theory

  8. Type 1: • only below critical temperature & critical magnetic field strength • changing between states abruptly • Type 2: • much higher critical fields & could carry higher current densities while remaining superconductivity Different types

  9. Strong magnets: • MRI, Maglev, LHC, Coilguns,... • SQID magnetometer • RF and microwave filter • Low-loss power cables • Electric powered: • Motors, generators, transformers Applications

  10. Zero resistance • Expulsion of magnetic field lines • Two different types • Cool but very expensive applications • Questions ? Summary

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