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|Title:||Possible Mechanism of Superconductivity in PuCoGa5 Probed by Self-irradiation Damage|
|Authors:||UMMARINO G. A.; GRIVEAU JEAN-CHRISTOPHE; WASTIN FRANCK; COLINEAU ERIC; REBIZANT JEAN; MAGNANI Nicola; CACIUFFO ROBERTO; JUTIER F.|
|Citation:||PHYSICAL REVIEW B vol. 77 p. 024521|
|Publisher:||AMERICAN PHYSICAL SOC|
|Type:||Articles in periodicals and books|
|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 Directorate:||Nuclear Safety and Security|
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