skip to main content

DOE PAGESDOE PAGES

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

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:
Grant/Contract Number:
FG02-04-ER46105; DMR1206553; FG02-04ER46105
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)
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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1418496
Alternate Identifier(s):
OSTI ID: 1240481