Title: Gallium substitution in the transuranium superconductor PuCoGa5
Authors: COLINEAU ERICBOULET PASCALGRIVEAU JEAN-CHRISTOPHEELOIRDI RACHELWASTIN FRANCKSHICK A. B.CACIUFFO ROBERTO
Citation: JOURNAL OF ALLOYS AND COMPOUNDS vol. 745 p. 477-482
Publisher: ELSEVIER SCIENCE SA
Publication Year: 2018
JRC N°: JRC112130
ISSN: 0925-8388 (online)
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC112130
DOI: 10.1016/j.jallcom.2018.02.116
Type: Articles in periodicals and books
Abstract: We have studied the effects of substituting gallium by aluminum, germanium, tin and indium in PuCoGa5, the actinide-based superconductor with the highest critical temperature. By annealing arc-melted samples, we have been able to synthesize only compounds with 20% substitution by Al and Ge (i.e. PuCoGa4Al and PuCoGa4Ge). Refinements of X-ray powder diffraction patterns for these two compounds indicate an enhanced c/a ratio, whereas magnetic susceptibility measurements reveal a large reduction of the critical temperature Tc compared to PuCoGa5. DFT+ED calculations indicate that the decrease of Tc is accompanied by significant changes in the Fermi surface. Finally, measurements on PuCoGa5 samples made by using 69Ga and 71Ga isotopes showed no effect of the atomic mass of gallium on the superconducting critical temperature.
JRC Directorate:Nuclear Safety and Security

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