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Evolution of the Fishtail-Effect in Pure and Ag-doped MG-YBCO

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Abstract

We report on magnetic measurements carried out in a textured YBa2Cu3O7−δ and YBa2(Cu1−x Ag x )3O7−δ (at x≈ 0.02) crystals. The so-called fishtail-effect (FE) or second magnetization peak has been observed in a wide temperature range 0.4 <T/T c < 0.8 for H ∥ c. The origin of the FE arises from the competition between surface barriers and bulk pinning. This is confirmed in a non-monotonically behavior of the relaxation rate R. The value H max for Ag-doped crystals is larger than for the pure one due to the presence of additional pinning centers, above all on silver atoms.

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Authors and Affiliations

  1. Physical Department, V.N. Karazin Kharkov National University, 4 Svoboda Square, 61077, Kharkov, Ukraine

    D. A. Lotnyk, R. V. Vovk, M. A. Obolenskii & A. A. Zavgorodniy

  2. Materials Physics Laboratory, Institute of Experimental Physics, Slovak Academy of Sciences, Watsonova 47, 04001, Košice, Slovakia

    J. Kováč, V. Antal, M. Kaňuchová, M. Šefčiková & P. Diko

  3. Centre of Low Temperature Physics, Faculty of Science, P.J. Šafarik University, Park Angelinum 9, 04154, Košice, Slovakia

    A. Feher

  4. Department of Materials, Imperial College, London, SW7 2AZ, UK

    A. Chroneos

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  1. D. A. Lotnyk
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  2. R. V. Vovk
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  3. M. A. Obolenskii
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  4. A. A. Zavgorodniy
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  5. J. Kováč
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  6. V. Antal
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  7. M. Kaňuchová
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  8. M. Šefčiková
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  9. P. Diko
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  10. A. Feher
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  11. A. Chroneos
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Correspondence to D. A. Lotnyk.

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Lotnyk, D.A., Vovk, R.V., Obolenskii, M.A. et al. Evolution of the Fishtail-Effect in Pure and Ag-doped MG-YBCO. J Low Temp Phys 161, 387–394 (2010). https://doi.org/10.1007/s10909-010-0198-z

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  • DOI: https://doi.org/10.1007/s10909-010-0198-z

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