Journal
PHYSICAL REVIEW B
Volume 70, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.70.104512
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We examine possible pairing mechanisms of superconductivity in PuCoGa5 based on spin-fluctuations or phonons as mediating bosons. We consider experimental data of specific heat C(T) and resistivity rho(T) as input to determine a consistent scattering boson with the superconducting transition temperature of 18.5 K in PuCoGa5. Irrespective to the type of boson, the characteristic boson frequency is found to be similar to150 K from the resistivity fitting. The spin fluctuation model is most consistent with the experimental resistivity, successfully explaining the anomalous temperature dependence [similar to(T-2/150 K+T)] at low temperatures as well as the saturation behavior at high temperatures. Assuming that the pairing state is a non s-wave, the large residual resistivity rho(imp)similar to20 muOmega cmsimilar to120 K suggests that an ideally pure sample of PuCoGa5 would have a maximum T-c of 39 K.
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