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Evidence for Irradiation Triggered Nonuniform Defects Distribution in Multiharmonic Magnetic Susceptibility of Neutron Irradiated YBa2Cu3O7− δ

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Multiharmonic ac-magnetic susceptibility χ1, χ2, χ3, of neutron irradiated Li-doped YBa2Cu3O7− x has revealed a nonmonotonic dependence of all harmonics on the neutron fluence. The irradiation has a strongly depressive influence on the intergrain connection suggesting an increase of the effective thickness of the intergranular Josephson junction at a neutron fluence of 0.98 × 1017 cm−2. Less damaged are the intragrain properties. A spectacular enhancement of the superconducting intragranular properties reflected in the characteristics of all harmonics was observed at highest fluence Φ = 9.98 × 1017 cm−2. We assume that this effect results from the development of a space inhomogeneous distribution with alternating defectless and defect-rich regions.

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ACKNOWLEDGMENTS

The research was supported in part by the European Community under the TARI contract HPRI-CT-1999-00088, and by Romanian Ministry of Education and Science in the framework of the MATNANTECH program, project 260/2004. We would like to thank to Dr Paolo Laurelli and Dr Sergio Bertolucci for the special support.

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Authors and Affiliations

  1. National Institute of Materials Physics, Bucharest-Magurele, POB-MG-7, R-76900, Romania

    V. Sandu & S. Popa

  2. INFN-LNF, National Laboratory of Frascati, Via E. Fermi 40, 00044, Frascati, Italy

    D. Di Gioacchino

  3. H.E.R.A., Hydrogen Energy Research Agency, Corso della Repubblica 448, 00049, Velletri, Italy

    P. Tripodi

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  1. V. Sandu
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  2. S. Popa
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  3. D. Di Gioacchino
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  4. P. Tripodi
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Correspondence to V. Sandu.

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Sandu, V., Popa, S., Di Gioacchino, D. et al. Evidence for Irradiation Triggered Nonuniform Defects Distribution in Multiharmonic Magnetic Susceptibility of Neutron Irradiated YBa2Cu3O7− δ . J Supercond 18, 573–581 (2005). https://doi.org/10.1007/s10948-005-0040-z

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  • DOI: https://doi.org/10.1007/s10948-005-0040-z

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