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Neutron-irradiated superconducting YBa2Cu3(Li)O7-δ with improved irreversibility

V. SANDU1,* , S. POPA1, E. SANDU2, D. DI GIOACCHINO3, P. TRIPODI4

Affiliation

  1. National Institute R&D of Materials Physics, Bucharest-Magurele, POBox MG-7, RO-077125, Romania
  2. National Institute of Physics and Nuclear Engineering “Horia Hulubei” Bucharest-Magurele, P.O. Box MG-6, RO-77125, Romania
  3. INFN-LNF, National Laboratory of Frascati, Via E. Fermi 40, 00044 Frascati, Italy
  4. Hydrogen Energy Research Agency, Corso della Repubblica 448, 00049 Velletri, Italy

Abstract

Irradiation of YBa2Cu3(Li)O7-δ ceramics with thermal and epithermal neutrons at fluences higher than 1017 neutrons/cm2 has led to a spectacular improvement of the intragranular properties. The critical current density has shown a monotonous dependence. The suppression of the critical temperature was below 2% but shows an increase at 9.8×1017 neutrons/cm2. This behaviour is consistent with the appearance of self-organized population of defects at high fluence. An analysis of the nature of the defect distribution, which is responsible for these effects, is provided..

Keywords

YBa2Cu3, Neutron irradiation, Magnetization, ac-susceptibility, Critical current density.

Submitted at: Sept. 13, 2005
Accepted at: Jan. 26, 2006

Citation

V. SANDU, S. POPA, E. SANDU, D. DI GIOACCHINO, P. TRIPODI, Neutron-irradiated superconducting YBa2Cu3(Li)O7-δ with improved irreversibility, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 1, pp. 391-395 (2006)