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Title: Superconducting and normal state properties of the systems La 1 - x M x Pt 4 Ge 12 ( M = Ce , Th )

Abstract

Electrical resistivity, magnetization, and specific heat measurements were performed on polycrystalline samples of the filled-skutterudite systems La 1-xM xPt 4Ge 12 (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 xPt 4Ge 12 show a change from power-law to exponential behavior, which may be an indication for multi-band superconductivity in LaPt 4Ge 12. A similar crossover was observed in the Pr 1-xCe xPt 4Ge 12 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 LaPt 4Ge 12 and unconventional in PrPt 4Ge 12. In comparison, a nearly linear and smooth evolution of T c with increasing Th was observed in the La 1-xTh xPt 4Ge 12 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 LaPt 4Ge 12 and ThPt 4Ge 12 compounds.

Authors:
 [1];  [2];  [2];  [3];  [2];  [2];  [1]
  1. Univ. of California, San Diego, CA (United States). Dept. of Physics, and Center for Advanced Nanoscience, and Materials Science and Engineering Program
  2. Univ. of California, San Diego, CA (United States). Dept. of Physics, and Center for Advanced Nanoscience
  3. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience, and Materials Science and Engineering Program
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1418612
Alternate Identifier(s):
OSTI ID: 1314344
Grant/Contract Number:  
FG02-04ER46105; DMR 1206553
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 9; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Huang, K., Yazici, D., White, B. D., Jeon, I., Breindel, A. J., Pouse, N., and Maple, M. B. Superconducting and normal state properties of the systems La1-xMxPt4Ge12 (M=Ce,Th). United States: N. p., 2016. Web. doi:10.1103/PhysRevB.94.094501.
Huang, K., Yazici, D., White, B. D., Jeon, I., Breindel, A. J., Pouse, N., & Maple, M. B. Superconducting and normal state properties of the systems La1-xMxPt4Ge12 (M=Ce,Th). United States. doi:10.1103/PhysRevB.94.094501.
Huang, K., Yazici, D., White, B. D., Jeon, I., Breindel, A. J., Pouse, N., and Maple, M. B. Thu . "Superconducting and normal state properties of the systems La1-xMxPt4Ge12 (M=Ce,Th)". United States. doi:10.1103/PhysRevB.94.094501. https://www.osti.gov/servlets/purl/1418612.
@article{osti_1418612,
title = {Superconducting and normal state properties of the systems La1-xMxPt4Ge12 (M=Ce,Th)},
author = {Huang, K. and Yazici, D. and White, B. D. and Jeon, I. and Breindel, A. J. and Pouse, N. and Maple, M. B.},
abstractNote = {Electrical resistivity, magnetization, and specific heat measurements were performed on polycrystalline samples of the filled-skutterudite systems La1-xMxPt4Ge12 (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 La1-xCexPt4Ge12 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 Pr1-xCexPt4Ge12 system. However, the suppression rates of the superconducting transition temperatures, Tc(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 Tc with increasing Th was observed in the La1-xThxPt4Ge12 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.},
doi = {10.1103/PhysRevB.94.094501},
journal = {Physical Review B},
number = 9,
volume = 94,
place = {United States},
year = {2016},
month = {9}
}

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Figures / Tables:

FIG. 1 FIG. 1: (Color online) (a) Powder X-ray diffraction pattern for a representative sample of La1−xCexPt4Ge12 (x = 0.6) where the blue line represents the intensity vs. 2$\circleddash$ and the red tick marks locate the 2$\circleddash$ positions of the expected Bragg reflections for the refined filled-skutterudite crystal structure. Black asterisks indicatemore » Bragg reflections associated with a Ge/PtGe2 impurity phase. The lattice parameter, $a$, is plotted for La1−xCexPt4Ge12 in panel (b) and for La1−xThxPt4Ge12 in panel (c). The dashed lines are guides to the eye. The $a$ vs. $x$ data for both La1−xCexPt4Ge12 and La1−xThxPt4Ge12 obey Vegard’s law, except for x = 1, in La1−xCexPt4Ge12, where $a$ has a larger value (see text). The $a$ values for LaPt4Ge12, CePt4Ge12, and ThPt4Ge12 are plotted for comparison.« less

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