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Träfflista för sökning "(WFRF:(Yang T T)) srt2:(1991-1994)"

Search: (WFRF:(Yang T T)) > (1991-1994)

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1.
  • Yang, Z.J., et al. (author)
  • Study of flux motion in Bi-based superconductors by a pendulum
  • 1992
  • In: Journal of Superconductivity. - 0896-1107 .- 1572-9605. ; 5:2, s. 127-135
  • Journal article (peer-reviewed)abstract
    • Using a computerized mechanical pendulum, we have studied the lateral magnetic flux motion of the Bi-based high-T c superconductors in the quasi-static magnetic field (0.1 Hz) for the range 1 μm to 0.35 mm. The effect of d.c. and a.c. transport currents on the flux motion has also been investigated. We argue that the lateral magnetic stiffness is a measure of the pinning potential of the fluxoids in the superconductors. The pinning energy barrier ε is estimated to be about 0.3 eV based on the stiffness measurements, which is comparable with the data from the YBa2Cu3O7-χ superconductors.
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  • Johansen, T.H., et al. (author)
  • Transition from elastic to dissipative motion in a magnet-high-Tc superconductor system
  • 1991
  • In: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 70:12, s. 7496-7499
  • Journal article (peer-reviewed)abstract
    • Using quasistatic harmonic excitations, we have measured the lateral force between a permanent magnet and a Bi-based ceramic high-Tc superconductor (HTSC) for lateral displacement amplitudes down to 1 µm. We find clear evidence for a transition from elastic (nondissipative) to inelastic interaction, and attribute the effect to flux pinning. The crossover amplitude can easily reach several micrometers, with the consequence that the lateral disturbance of a levitated magnet will decay to this amplitude, whereas further damping will be extremely slow. For applications of HTSCs in magnetic bearing systems this can be a very relevant aspect of the interaction, and it can set the limit for precision positioning of levitated objects
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