Title: Possible Mechanism of Superconductivity in PuCoGa5 Probed by Self-irradiation Damage
Authors: UMMARINO G. A.GRIVEAU JEAN-CHRISTOPHEWASTIN FRANCKCOLINEAU ERICREBIZANT JEANMAGNANI NicolaCACIUFFO ROBERTOJUTIER F.
Citation: PHYSICAL REVIEW B vol. 77 p. 024521
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2008
JRC Publication N°: JRC43898
ISSN: 1098-0121
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC43898
DOI: 10.1103/PhysRevB.77.024521
Type: Articles in Journals
Abstract: 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.
JRC Institute:Institute for Transuranium Elements

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