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Title: Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt 4 Ge 12 - x Sb x

Abstract

We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt 4Ge 12 - x Sb x. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4 , above which no signature of superconductivity was observed down to 140 mK. The Sommerfeld coefficient, γ , of superconducting specimens decreases with increasing x up to x = 3 , suggesting that superconductivity may depend on the density of electronic states in this system. Finally, the specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. Here we observed evidence for a weak “rattling” mode associated with the Pr ions, characterized by an Einstein temperature Θ E ~ 60 K for 0 ≤ x ≤ 5 ; however, the rattling mode may not play any role in suppressing superconductivity.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8]
  1. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program; Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience
  2. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics; Artvin Coruh Univ., Artvin (Turkey)
  3. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics; Chulalongkorn Univ., Pathumwan, Bangkok (Thailand)
  4. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics; Central Washington Univ., Ellensburg, WA (United States)
  5. California State Univ. (CalState), Fresno, CA (United States). Dept. of Physics
  6. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program; Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  7. Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics
  8. Univ. of California, San Diego, CA (United States). Materials Science and Engineering Program; Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics
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:
1418496
Alternate Identifier(s):
OSTI ID: 1240481
Grant/Contract Number:  
FG02-04-ER46105; DMR1206553; FG02-04ER46105
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 10; 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

Jeon, I., Huang, K., Yazici, D., Kanchanavatee, N., White, B. D., Ho, P. -C., Jang, S., Pouse, N., and Maple, M. B.. Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx. United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.104507.
Jeon, I., Huang, K., Yazici, D., Kanchanavatee, N., White, B. D., Ho, P. -C., Jang, S., Pouse, N., & Maple, M. B.. Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx. United States. doi:10.1103/PhysRevB.93.104507.
Jeon, I., Huang, K., Yazici, D., Kanchanavatee, N., White, B. D., Ho, P. -C., Jang, S., Pouse, N., and Maple, M. B.. Mon . "Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx". United States. doi:10.1103/PhysRevB.93.104507. https://www.osti.gov/servlets/purl/1418496.
@article{osti_1418496,
title = {Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx},
author = {Jeon, I. and Huang, K. and Yazici, D. and Kanchanavatee, N. and White, B. D. and Ho, P. -C. and Jang, S. and Pouse, N. and Maple, M. B.},
abstractNote = {We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12 - x Sbx. Polycrystalline samples with Sb concentrations up to x = 5 were synthesized and investigated by means of x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. We observed a suppression of superconductivity with increasing Sb substitution up to x = 4 , above which no signature of superconductivity was observed down to 140 mK. The Sommerfeld coefficient, γ , of superconducting specimens decreases with increasing x up to x = 3 , suggesting that superconductivity may depend on the density of electronic states in this system. Finally, the specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. Here we observed evidence for a weak “rattling” mode associated with the Pr ions, characterized by an Einstein temperature ΘE ~ 60 K for 0 ≤ x ≤ 5 ; however, the rattling mode may not play any role in suppressing superconductivity.},
doi = {10.1103/PhysRevB.93.104507},
journal = {Physical Review B},
number = 10,
volume = 93,
place = {United States},
year = {2016},
month = {3}
}

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