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Direct determination of the vortex jump attempt frequency in high temperature superconductors

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Fontcuberta, J.
Published in Physica C: Superconductivity and Its Applications. 1994, vol. 235-240, p. 2981-2982
Abstract We show that the frequency dependence of the effective critical current, resulting from thermally activated flux motion, may be used to evaluates the jump attempt frequency fo of over vortices over their pinning potential wells. We apply this analysis to estimate fo for a Nd1.85Ce0.15CuO4−y single crystal. The obtained value, fo≈109Hz, is in agreement with the theoretical estimates; furthermore, this high value, together with the experimental activation energies U(T,H,J), allow to explain the important thermally activated flux motion effects in these superconductors, observed at low temperatures or high frequencies.
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FABREGA SANCHEZ, Maria Lourdes, FONTCUBERTA, J. Direct determination of the vortex jump attempt frequency in high temperature superconductors. In: Physica C: Superconductivity and Its Applications, 1994, vol. 235-240, p. 2981-2982. https://archive-ouverte.unige.ch/unige:92701

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Deposited on : 2017-03-21

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