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Effects of Small Fields on the Magnetic Response of Superconducting Thin Films of MgB2

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Abstract

Under the influence of a magnetic field applied perpendicularly to its plane, a superconducting thin film develops dendritic patterns of penetrated regions that coexist with Meissner areas. For a thin film of MgB2 submitted to an alternate field of moderate amplitude, the AC susceptibility measured while cooling the sample exhibits a quite unusual behavior, reentering and fluctuating with temperature. The effect is more pronounced at frequencies around 1 kHz. Two plausible explanations for the effect are discussed.

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Authors and Affiliations

  1. Grupo de Supercondutividade e Magnetismo, Departamento de Física, UFSCar, Caixa Postal 676, 13565-905 Sao Carlos, SP, Brazil

    W. A. C. Passos, P. N. Lisboa-Filho & W. A. Ortiz

  2. Physics Department, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    W. N. Kang, Eun-Mi Choi, Hyeong-Jin Kim & Sung-Ik Lee

Authors
  1. W. A. C. Passos
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  2. P. N. Lisboa-Filho
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  3. W. N. Kang
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  4. Eun-Mi Choi
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  5. Hyeong-Jin Kim
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  6. Sung-Ik Lee
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  7. W. A. Ortiz
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Passos, W.A.C., Lisboa-Filho, P.N., Kang, W.N. et al. Effects of Small Fields on the Magnetic Response of Superconducting Thin Films of MgB2 . Journal of Superconductivity 15, 479–482 (2002). https://doi.org/10.1023/A:1021019624559

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  • DOI: https://doi.org/10.1023/A:1021019624559

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