Effect of Current on Collective Motion of Flux Lines in a Bulk Y_1Ba_2Cu_3O_<7-δ> Superconductor

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概要

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• When a permanent magnet, placed above a high temperature superconductor (HTSC), is moved by an external force, the flux lines in the HTSC will follow the magnet and perform a collective motion due to the interaction between the flux lines and the magnet. Here, the collective motion of flux lines in an Y_1Ba_2Cu_3O_<7-δ>(Y123) HTSC is studied by a mechanical pendulum method for various transport currents I through the sample. The magnet is set in low frequency (typically 1 Hz) oscillations with a mechanical pendulum, and the current I is flowing perpendicular to the direction of the magnet motion. The experiments show that the shift of the stiffness (correspoding the shift of the frequency squared) exhibits a crossover phenomenon: from independence to power law-like dependence for increasing currents. the results are compared with the theories of collective flux creep in HTSCs.

• 社団法人応用物理学会の論文
• 1991-01-15

著者

• Johansen T.h.

  Department Of Physics Univetsity Of Oslo

• Johansen T.h.

  Department Of Physics University Of Oslo

• Yang Z.J.

  Department of Physics, Univetsity of Oslo

• Bratsberg H.

  Department of Physics, Univetsity of Oslo

• Helgesen G.

  Department of Physics, Univetsity of Oslo

• Skjeltorp A.T.

  Institute for Enegy Technology

• Yang Z.j.

  Department Of Physics Univetsity Of Oslo

• Helgesen G.

  Department Of Physics Univetsity Of Oslo

• Bratsberg H.

  Department Of Physics Univetsity Of Oslo

関連論文

• Purely magnetization-induced second-harmonic generation in thin garnet films(Magnetism and Spin Dynamics)
• Effect of Current on Collective Motion of Flux Lines in a Bulk Y_1Ba_2Cu_3O_ Superconductor

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