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dc.contributor.authorELOIRDI RACHELen_GB
dc.contributor.authorGIACOBBE CARLOTTAen_GB
dc.contributor.authorAMADOR CELDRAN PEDROen_GB
dc.contributor.authorMAGNANI NICOLAen_GB
dc.contributor.authorLANDER G. H.en_GB
dc.contributor.authorGRIVEAU JEAN-CHRISTOPHEen_GB
dc.contributor.authorCOLINEAU ERICen_GB
dc.contributor.authorMIYAKE KAZUMASAen_GB
dc.contributor.authorCACIUFFO ROBERTOen_GB
dc.identifier.citationPHYSICAL REVIEW B vol. 95 no. 9 p. 094517en_GB
dc.description.abstractWe have performed high-resolution powder x-ray-diffraction measurements on a sample of 242PuCoGa5, the heavy-fermion superconductor with the highest critical temperature of Tc=18.7K. The results show that the tetragonal symmetry of its crystallographic lattice is preserved down to 2 K. Marginal evidence is obtained for an anomalous behavior below Tc of the a and c lattice parameters. The observed thermal expansion is isotropic down to 150 K and becomes anisotropic for lower temperatures. This gives a c/a ratio that decreases with increasing temperature to become almost constant above ∼150K. The volume thermal expansion coefficient αV has a jump at Tc, a factor ∼20 larger than the change predicted by the Ehrenfest relation for a second-order phase transition. The volume expansion deviates from the curve expected for the conventional anharmonic behavior described by a simple Grüneisen-Einstein model. The observed differences are about ten times larger than the statistical error bars but are too small to be taken as an indication for the proximity of the system to a valence instability that is avoided by the superconducting state.en_GB
dc.description.sponsorshipJRC.G.I.5-Advanced Nuclear Knowledgeen_GB
dc.publisherAMER PHYSICAL SOCen_GB
dc.titleThermal Expansion of the Heavy-fermion Superconductor PuCoGa5en_GB
dc.typeArticles in periodicals and booksen_GB
JRC Directorate:Nuclear Safety and Security

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