超伝導体の交流磁場応答

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タイトル別名
  • AC Magnetic Response of Superconductors.
  • チョウデンドウタイ ノ コウリュウ ジバ オウトウ

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説明

The measurement of complex susceptibilities Xn = Xn' - ixn" in a weak ac magnetic field is one of the useful probes for the study of the magnetic response of type-II superconductors. The fundamental susceptibility X1 provides two different physical natures of the material. Namely, the real component is caused by the magnetic shielding, indicating the phase transition between the superconducting and the normal states. Meanwhile, the imaginary component is proportional to the energy dissipation in the specimen. Higher-harmonic susceptibilities Xn (n ≥ 2) give information on the magnetization which is closely related to the shielding current induced in the sample. We review in this article Xn observed for ceramic high-Tc superconductors and the theoretical analysis of the results within the construct of the critical-state model.

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