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On the Applicability of the Magnetic Susceptibility Models for the Magnetic Superconductor Ru-1212

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Abstract

The applicability of theoretical models for the ac susceptibility measurements of polycrystalline RuSr2GdCu2O8 superconductor has been examined within the temperature range between 8–50 K, ac magnetic field 0.5–25 G, and frequency 20–12500 Hz. In general, a reasonable qualitative agreement between theory and experiment was attained. An evident and detectable asymmetry was observed within the Cole–Cole polar plots with a peak enhancement for both theoretical and experimental data. The modified critical state models are found to generate much better explanation of the ac susceptibility measured data than Bean’s model. For fields above 20 G, the results are agreed roughly with the Bean critical state model, while below 20 G, the Kim–Anderson model is more suitable to account of the magnetic performance. The temperature and field amplitude dependencies of the flux-creep exponent, n, were extracted from the real part of susceptibility, χ′, dependence on frequency. The flux-creep exponent was found to decrease with both temperature and ac field amplitude in accordance to a power-law of the form: n(T,H)=n 0(H)T −s(H). Such dependence might be an indication of a crossover to flux-creep bundles regime.

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Authors and Affiliations

  1. Physics Department, College of Science and Technology, Al-Quds University, PO Box 20002, East Jerusalem, Abu-Deis, West Bank, via Israel

    M. M. Abu-Samreh, A. M. Saleh & R. M.-L. Kitaneh

  2. Physikalisches Institut, Universität Bayreuth, 95440, Bayreuth, Germany

    H. F. Braun

Authors
  1. M. M. Abu-Samreh
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  2. A. M. Saleh
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  3. R. M.-L. Kitaneh
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  4. H. F. Braun
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Correspondence to A. M. Saleh.

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Abu-Samreh, M.M., Saleh, A.M., Kitaneh, R.ML. et al. On the Applicability of the Magnetic Susceptibility Models for the Magnetic Superconductor Ru-1212. J Supercond Nov Magn 21, 57–63 (2008). https://doi.org/10.1007/s10948-007-0297-5

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  • DOI: https://doi.org/10.1007/s10948-007-0297-5

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