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Title: Superconductivity in the presence of disorder in skutterudite-related La 3Co 4Sn 13 and La 3Ru 4Sn 13 compounds: Electrical transport and magnetic studies

La 3Co 4Sn 13 and La 3Ru 4Sn 13 were categorized as BCS superconductors. In a plot of the critical field H c2 vs T, La 3Ru 4Sn 13 displays a second superconducting phase at the higher critical temperature T c*, characteristic of inhomogeneous superconductors, while La 3Co 4Sn 13 shows bulk superconductivity below T c. We observe a decrease in critical temperatures with external pressure and magnetic field for both compounds. Additionally, for La 3Ru 4Sn 13 we find that T c*/dP>dT c/dP. The pressure dependences of T c are interpreted according to the McMillan theory and understood to be a consequence of lattice stiffening. The investigation of the superconducting state of La 3Co xRu 4–xSn 13 shows a T c* that is larger then T c for x < 4. Furthermore, this unique and unexpected observation is discussed as a result of the local disorder and/or the effect of chemical pressure when Ru atoms are partially replaced by smaller Co atoms.
 [1] ;  [1] ;  [1] ;  [2] ;  [2]
  1. Univ. of Silesia, Katowice (Poland)
  2. Univ. of California, San Diego, La Jolla, CA (United States)
Publication Date:
Grant/Contract Number:
NA0002909; NA0001841
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 646; Journal Issue: C; Journal ID: ISSN 0925-8388
Research Org:
Univ. of California, San Diego, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconductivity; atomic disorder; heavy fermions; strongly correlated electron systems
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1339176