Pinning in High-Tc Superconductors
Magnetic flux can penetrate a type-II superconductor in the form of flux-lines or Abrikosov vortices, each of which carry a quantum of flux and arrange in a more or less regular triangular lattice. Under the action of an electric current, these flux lines move and dissipate energy unless they are pi...
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| Format: | Article |
| Language: | English |
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Wiley
1993-01-01
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| Series: | Active and Passive Electronic Components |
| Online Access: | http://dx.doi.org/10.1155/1993/45791 |
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| author | Ernst Helmut Brandt |
| author_facet | Ernst Helmut Brandt |
| author_sort | Ernst Helmut Brandt |
| collection | DOAJ |
| description | Magnetic flux can penetrate a type-II superconductor in the form of flux-lines or Abrikosov vortices,
each of which carry a quantum of flux and arrange in a more or less regular triangular lattice. Under
the action of an electric current, these flux lines move and dissipate energy unless they are pinned by
material inhomogeneities. In conventional superconductors, depinning occurs when a critical current
density Jc is exceeded. In high-Tc superconductors (HTSC), thermally activated depinning causes a finite
resistivity t9 even at current densities J ≪ Jc. At sufficiently large temperature T, linear (ohmic) resistivity
is observed down to J → 0. This indicates that the flux lines are in a "liquid state" with no shear stiffness
and with small depinning energy. At lower T, ρ(J) is highly nonlinear, since the pinning energy increases
with decreasing J. In highly anisotropic Bi- and Tl-based HTSC, thermal depinning occurs at rather
low T, since short vortex segments ("pancake vortices" in the CuO layers) can depin individually with
very small activation energy. |
| format | Article |
| id | doaj-art-4dd28340b3b64d739712c1a6fdc504df |
| institution | Kabale University |
| issn | 0882-7516 1563-5031 |
| language | English |
| publishDate | 1993-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Active and Passive Electronic Components |
| spelling | doaj-art-4dd28340b3b64d739712c1a6fdc504df2025-02-03T06:44:27ZengWileyActive and Passive Electronic Components0882-75161563-50311993-01-01153-419321010.1155/1993/45791Pinning in High-Tc SuperconductorsErnst Helmut Brandt0Max-Planck-lnstitut für Metallforschung, Institut für Physik Heisenbergstr. 1, W-7000 Stuttgart 80, GermanyMagnetic flux can penetrate a type-II superconductor in the form of flux-lines or Abrikosov vortices, each of which carry a quantum of flux and arrange in a more or less regular triangular lattice. Under the action of an electric current, these flux lines move and dissipate energy unless they are pinned by material inhomogeneities. In conventional superconductors, depinning occurs when a critical current density Jc is exceeded. In high-Tc superconductors (HTSC), thermally activated depinning causes a finite resistivity t9 even at current densities J ≪ Jc. At sufficiently large temperature T, linear (ohmic) resistivity is observed down to J → 0. This indicates that the flux lines are in a "liquid state" with no shear stiffness and with small depinning energy. At lower T, ρ(J) is highly nonlinear, since the pinning energy increases with decreasing J. In highly anisotropic Bi- and Tl-based HTSC, thermal depinning occurs at rather low T, since short vortex segments ("pancake vortices" in the CuO layers) can depin individually with very small activation energy.http://dx.doi.org/10.1155/1993/45791 |
| spellingShingle | Ernst Helmut Brandt Pinning in High-Tc Superconductors Active and Passive Electronic Components |
| title | Pinning in High-Tc Superconductors |
| title_full | Pinning in High-Tc Superconductors |
| title_fullStr | Pinning in High-Tc Superconductors |
| title_full_unstemmed | Pinning in High-Tc Superconductors |
| title_short | Pinning in High-Tc Superconductors |
| title_sort | pinning in high tc superconductors |
| url | http://dx.doi.org/10.1155/1993/45791 |
| work_keys_str_mv | AT ernsthelmutbrandt pinninginhightcsuperconductors |