Investigation of superconducting and normal-state properties of the filled-skutterudite system
- 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). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics; Artvin Coruh Univ., Artvin (Turkey)
- 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)
- 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)
- California State Univ. (CalState), Fresno, CA (United States). Dept. of Physics
- 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)
- Univ. of California, San Diego, CA (United States). Center for Advanced Nanoscience; Univ. of California, San Diego, CA (United States). Dept. of Physics
- 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
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.
- Research Organization:
- Univ. of California, San Diego, CA (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- FG02-04-ER46105; DMR1206553; FG02-04ER46105
- OSTI ID:
- 1418496
- Alternate ID(s):
- OSTI ID: 1240481
- Journal Information:
- Physical Review B, Vol. 93, Issue 10; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Magnetic field dependence of the Schottky anomaly in filled skutterudites
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journal | November 2019 |
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