Superconducting and normal state properties of the systems La1-xMxPt4Ge12 (M=Ce,Th)

Huang, K.; Yazici, D.; White, B. D.; Jeon, I.; Breindel, A. J.; Pouse, N.; Maple, M. B.

doi:10.1103/PhysRevB.94.094501

Superconducting and normal state properties of the systems ${La}_{1 - x} M_{x} {Pt}_{4} {Ge}_{12}$ ( $M = Ce, Th$ )

Journal Article · Thu Sep 01 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.094501· OSTI ID:1418612

Huang, K. ^[1]; Yazici, D. ^[2]; White, B. D. ^[2]; Jeon, I. ^[3]; Breindel, A. J. ^[2]; Pouse, N. ^[2]; Maple, M. B. ^[4]

Univ. of California, San Diego, CA (United States). Dept. of Physics, and Center for Advanced Nanoscience, and Materials Science and Engineering Program; DOE OSTI
Univ. of California, San Diego, CA (United States). Dept. of Physics, and Center for Advanced Nanoscience
Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience, and Materials Science and Engineering Program
Univ. of California, San Diego, CA (United States). Dept. of Physics, and Center for Advanced Nanoscience, and Materials Science and Engineering Program

Electrical resistivity, magnetization, and specific heat measurements were performed on polycrystalline samples of the filled-skutterudite systems La_1-xM_xPt₄Ge₁₂ (M = Ce, Th). Superconductivity in LaPt4Ge12 was quickly suppressed with Ce substitution and no evidence for superconductivity was found down to 1.1 K for x > 0.2. Temperature-dependent specific heat data at low temperatures for La_1-xCe_xPt₄Ge₁₂ show a change from power-law to exponential behavior, which may be an indication for multi-band superconductivity in LaPt₄Ge₁₂. A similar crossover was observed in the Pr_1-xCe_xPt₄Ge₁₂ system. However, the suppression rates of the superconducting transition temperatures, T_c(x), in the two systems are quite disparate, indicating a difference in the nature of superconductivity, which is conventional in LaPt₄Ge₁₂ and unconventional in PrPt₄Ge₁₂. In comparison, a nearly linear and smooth evolution of T_c with increasing Th was observed in the La_1-xTh_xPt₄Ge₁₂ system, with no change of the superconducting energy gap in the temperature dependence of the specific heat, suggesting similar types of superconductivity in both the LaPt₄Ge₁₂ and ThPt₄Ge₁₂ compounds.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: FG02-04ER46105

OSTI ID:: 1418612

Alternate ID(s):: OSTI ID: 1314344

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 9 Vol. 94; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Superconducting and normal state properties of the systems ${La}_{1 - x} M_{x} {Pt}_{4} {Ge}_{12}$ ( $M = Ce, Th$ )