Superconductivity in the presence of disorder in skutterudite-related La3Co4Sn13 and La3Ru4Sn13 compounds: Electrical transport and magnetic studies

La3Co4Sn13 and La3Ru4Sn13 were categorized as BCS superconductors. In a plot of the critical field Hc2 vs T, La3Ru4Sn13 displays a second superconducting phase at the higher critical temperature Tc⋆, characteristic of inhomogeneous superconductors, while La3Co4Sn13 shows bulk superconductivity below...

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Bibliographic Details
Published in:Journal of alloys and compounds 2015-10, Vol.646 (C), p.866-872
Main Authors: Ślebarski, A., Maśka, M.M., Fijałkowski, M., McElroy, C.A., Maple, M.B.
Format: Article
Language:English
Subjects:
Atomic disorder
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Heavy fermions
Strongly correlated electron systems
Superconductivity
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Summary:La3Co4Sn13 and La3Ru4Sn13 were categorized as BCS superconductors. In a plot of the critical field Hc2 vs T, La3Ru4Sn13 displays a second superconducting phase at the higher critical temperature Tc⋆, characteristic of inhomogeneous superconductors, while La3Co4Sn13 shows bulk superconductivity below Tc. We observe a decrease in critical temperatures with external pressure and magnetic field for both compounds. Additionally, for La3Ru4Sn13 we find that dTc⋆/dP>dTc/dP. The pressure dependences of Tc are interpreted according to the McMillan theory and understood to be a consequence of lattice stiffening. The investigation of the superconducting state of La3CoxRu4−xSn13 shows a Tc⋆ that is larger then Tc for x 
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2015.06.198