Measurements of the electrical resistivity of a polycrystalline PuCoGa5 sample reveal significant modifications
of the superconducting properties as a function of time, due to the increase of defects and impurities
resulting from self-irradiation damage. More than four years of aging were necessary to detect a deviation from
linearity in the time dependence of the critical temperature. The observed behavior is understood in the
framework of the Eliashberg theory, confirming the ¿dirty¿ d-wave character which was already suggested by
nuclear magnetic resonance. We show that experimental data accumulated so far can be well reproduced by
assuming a phononic mechanism for superconductivity, with reasonable values of the electron-phonon coupling
and Coulomb pseudopotential. Further experiments are then required to assess the role of spin fluctuations
in stabilizing the superconducting state in this compound.
UMMARINO G. A.;
GRIVEAU Jean-Christophe;
WASTIN Franck;
COLINEAU Eric;
REBIZANT Jean;
MAGNANI Nicola;
CACIUFFO Roberto;
JUTIER F.;
2008-03-07
AMERICAN PHYSICAL SOC
JRC43898
1098-0121,
https://publications.jrc.ec.europa.eu/repository/handle/JRC43898,
10.1103/PhysRevB.77.024521,
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