Multipole phenomena and superconductivity in Pr-based filled skutterudites

Toshiro Sakakibara*, Kazuhiro Yano, Hidekazu Sato, Takashi Tayama, Jeroen Custers, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Field-orientation dependent specific heat C(H, θ) and the magnetization M(H, θ) have been measured on the Pr-based filled skutterudite compounds PrOs4Sb12 and PrFe 4P12. In PrOs4Sb12, fourfold angular oscillations of C(H, θ) have been observed in the normal state above the upper critical field Hc2 as well as in the vortex state. Field variation of the normal-state oscillation in C(H, θ) strongly suggests that antiferroquadrupolar fluctuations exist in the wide region above H c2. The oscillation exhibits a sign reversal below Hc2, whose origin is attributed to the nodal structure in which the superconducting gap takes minima (point nodes) along [100] directions. In PrFe4P 12, an exotic ordered phase (A-phase) below TA(H = 0)=6.5 K has been examined. Both M(H, θ) within the A-phase and TA(H, θ) show a smooth angular variation with a cubic anisotropy for H rotated in the (001) and (110) planes. The results strongly suggest that cubic symmetry is preserved in the A-phase; the order parameter is of Γ1 + type.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalJournal of the Physical Society of Japan
Volume77
Issue numberSUPPL.A
DOIs
StatePublished - 2008

Keywords

  • Gap structure
  • Magnetization
  • Multipole order
  • Skutterudite
  • Specific heat
  • Unconventional superconductivity

ASJC Scopus subject areas

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Multipole phenomena and superconductivity in Pr-based filled skutterudites'. Together they form a unique fingerprint.

Cite this