Role of self-irradiation defects on the ageing ofF. Jutier1, J.-C. Griveau1, C. J. van der Beek2, E. Colineau1, F. Wastin1, J. Rebizant1, P. Boulet1, T. Wiss1, H. Thiele1 and E. Simoni3
1 European Commission, Joint Research Centre, Institute for Transuranium Elements Postfach 2340, 76125 Karlsruhe, Germany
2 Laboratoire des Solides Irradiés, CNRS-UMR 7642 & CEA/DSM/DRECAM, Ecole Polytechnique 91128 Palaiseau Cedex, France
3 Institut de Physique Nucléaire - 91406 Orsay Cedex, France
received 2 November 2006; accepted in final form 26 April 2007; published June 2007
published online 31 May 2007
Low-temperature accumulation and annealing experiments, in conjunction with electrical resitivity and critical current density measurements, were used to study the ageing of the actinide superconductor PuCoGa5. These measurements reveal that 2-nmsized non-superconducting point-like regions are the main damages formed during room temperature ageing; smaller point-like defects are irrelevant to transport properties. Defect sizes and densities deduced from experiment agree with Transmission Electron Microscopy observations.
74.62.Dh - Effects of crystal defects, doping and substitution.
74.25.Qt - Vortex lattices, flux pinning, flux creep.
61.80.-x - Physical radiation effects, radiation damage.
© Europhysics Letters Association 2007