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Quantum Tunneling of Vortices in High-T c Superconductors: Magnetic Relaxation Experiments in TlBaCaCuO Compounds

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Quantum Tunneling of Magnetization — QTM ’94

Part of the book series: NATO ASI Series ((NSSE,volume 301))

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Abstract

Magnetic relaxation experiments in TlBaCaCuO superconductors (2212 and 2223 single phases, polycrystalline and thin film materials) are reported. The results give evidence of a crossover from thermally to non-thermally activated flux motion. The temperature independent magnetic relaxation rates (below ≃ 6 K and ≃ 3 K for the 2212 and 2223 phase respectively) compare well with the values calculated according to the theories of flux motion by quantum tunneling. The effect of anisotropy and magnetic field on the quantum creep rate is discussed.

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Author information

Authors and Affiliations

  1. Istituto di Chimica dei Materiali, Area della Ricerca di Roma, CNR, CP 10-00016, Monterotondo Staz., Roma, Italy

    D. Fiorani & A. M. Testa

  2. Departament de Física Fonamental, Facultat de Física, Universitat de Barcelona, Diagonal 647, E-08028, Barcelona, Spain

    A. Garcia, X. X. Zhang & J. Tejada

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  1. D. Fiorani
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  2. A. Garcia
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  3. X. X. Zhang
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  4. A. M. Testa
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  5. J. Tejada
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Editor information

Editors and Affiliations

  1. Department of Physics and Astronomy, Tufts University, Medford, MA, USA

    Leon Gunther

  2. Laboratoire de Magnétisme Louis Néel, CNRS, Grenoble, France

    Bernard Barbara

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Fiorani, D., Garcia, A., Zhang, X.X., Testa, A.M., Tejada, J. (1995). Quantum Tunneling of Vortices in High-T c Superconductors: Magnetic Relaxation Experiments in TlBaCaCuO Compounds. In: Gunther, L., Barbara, B. (eds) Quantum Tunneling of Magnetization — QTM ’94. NATO ASI Series, vol 301. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0403-6_24

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  • DOI: https://doi.org/10.1007/978-94-011-0403-6_24

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-4180-5

  • Online ISBN: 978-94-011-0403-6

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