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Opportunities in High Magnetic Field Science (2005) / Chapter Skim
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Appendix H Tutorial on Frontiers in Vortex Physics
Pages 166-172

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From page 166...
... The study of vortex matter in high fields over the full phase diagram is one of the most appealing research areas in condensed-matter physics. It is interesting not only because vortex system properties govern the charge transport and magnetic properties of HTS materials and, more generally, all Type II superconductors, but also because the behavior of these complex objects is generic for almost all disordered condensed-matter systems, so that cutting-edge contemporary concepts, involved theoretical methods, and the most advanced experimental techniques will be required to understand them.
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From page 167...
... The radius of strong interaction between vortices is determined by , generally 200-400 nm for HTS materials. At distances exceeding this scale, interactions are screened and become exponentially weaker.
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From page 168...
... Experiments using the Josephson plasma resonance effect in high magnetic fields may provide decisive answers. There are three main directions in the study of vortex matter today: · What factors control the pinning of vortices?
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From page 169...
... In conventional superconductors, the vortex-melting line was not detected since it lies very close to the upper critical field Hc2. In HTS materials, however, the melted phase -- the vortex liquid -- occupies a significant part of the vortex phase diagram.
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From page 170...
... Experiments on magnetic relaxation in HTS materials in 1990 confirmed that vortex motion at low temperatures obeys the prediction just discussed. Since then, extensive studies of the peculiarities of vortex dynamics in low-temperature vortex phases -- vortex and Bose glasses -- has become the focus of both experimental and theoretical research on superconductors.
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From page 171...
... NONSTANDARD EFFECTS Although vortex physics governs many aspects of superconductivity, it has some manifestation in HTS materials (particularly those that are ceramics) , which, because they have a layered structure, have no analogues in conventional superconductors.
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From page 172...
... Interactions between a moving Josephson plasma and the underlying periodic potential of the lattice of the material in which it exists may make it possible to generate sharp signals at terahertz frequencies. Devices exploiting these effects might include high-resolution filters, high-sensitivity detectors, and AC field generators in the terahertz frequency range (for terahertz lasers)
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Key Terms

  • josephson plasma
  • dynamic melting
  • josephson plasmas
  • adjacent layers
  • amorphous vortex

  • underlying periodic
  • vortex discs
  • forces due
  • superconducting films
  • moving josephson

  • effective shaking
  • layers couple
  • distributed pinning
  • devices exploiting
  • frequency range

  • interact magnetically
  • called josephson
  • random forces
  • randomly distributed
  • main diagnostics

  • vortices induced
  • pancakes behaves
  • periodic structure
  • charged particles
  • vortex structures

  • layers taking
  • terahertz frequencies
  • generate sharp
  • pinning sites
  • actually appear


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