Evidence for Irradiation Triggered Nonuniform Defects Distribution in Multiharmonic Magnetic Susceptibility of Neutron Irradiated YBa2Cu3O7?δ |
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| Authors: | V Sandu S Popa D Di Gioacchino and P Tripodi |
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| Affiliation: | (1) National Institute of Materials Physics, Bucharest-Magurele, POB-MG-7, R-76900, Romania;(2) INFN-LNF, National Laboratory of Frascati, Via E. Fermi 40, 00044 Frascati, Italy;(3) H.E.R.A., Hydrogen Energy Research Agency, Corso della Repubblica 448, 00049 Velletri, Italy |
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| Abstract: | 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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