Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx
Yükleniyor...
Dosyalar
Tarih
2016
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Amer Physical Assoc
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
We report a study of the superconducting and normal-state properties of the filled-skutterudite system PrPt4Ge12-xSbx. 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, gamma, 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. The specific heat for x = 0.5 exhibits an exponential temperature dependence in the superconducting state, reminiscent of a nodeless superconducting energy gap. We observed evidence for a weak "rattling" mode associated with the Pr ions, characterized by an Einstein temperature Theta(E) similar to 60 K for 0 <= x <= 5; however, the rattling mode may not play any role in suppressing superconductivity.
Açıklama
This work was supported by the US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Grant No. DE-FG02-04-ER46105 (characterization and physical properties measurements), and the National Science Foundation under Grant No. DMR 1206553 (low-temperature measurements). Helpful discussions with S. Ran are gratefully acknowledged.
Anahtar Kelimeler
Kaynak
Physical Review B
WoS Q Değeri
N/A
Scopus Q Değeri
Q1
Cilt
93
Sayı
10
Künye
Jeon, I., Huang, K., Yazici, D., Kanchanavatee, N., White, B. D., Ho, P. C., ... & Maple, M. B. (2016). Investigation of superconducting and normal-state properties of the filled-skutterudite system PrPt 4 Ge 12− x Sb x. Physical Review B, 93(10), 104507.
