Sb-NQR study of PrOs4Sb12 under high pressure

Shinji Kawasaki, Kouta Katayama, Masahide Nishiyama, Hisashi Kotegawa, Tatsuo C. Kobayashi, Hitoshi Sugawara, Daisuke Kikuchi, Hideyuki Sato, Guo Qing Zheng

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1 Citation (Scopus)

Abstract

We report 123Sb nuclear quadrupole resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs4Sb 12 under high pressure. The temperature dependence of NQR frequency and spin-lattice relaxation rate 1/T1 indicate that the crystal electric field splitting ΔCEF between the ground state Γ1 singlet and the first excited state Γ4 (2) triplet decreases with increasing pressure. However, it is found ΔCEF and Tc stay constant above P ∼ 2 GPa revealed by Sb-NQR up to P = 3.82 GPa for the first time. Remarkably, the temperature dependence of 1/T1 below Tc = 1.55 K at P = 1.91 GPa shows no coherence peak just below Tc and power-law behavior well below Tc in contrast to the exponential decrease observed at P = 0. Present results indicate the superconductivity in PrOs4Sb 12 under pressure has nodes in the superconducting gap function.

Original languageEnglish
Pages (from-to)330-332
Number of pages3
Journaljournal of the physical society of japan
Volume77
Issue numberSUPPL.A
DOIs
Publication statusPublished - Jan 1 2008

Keywords

  • Nuclear quadrupole resonance
  • PrOsSb
  • Pressure
  • Unconventional superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kawasaki, S., Katayama, K., Nishiyama, M., Kotegawa, H., Kobayashi, T. C., Sugawara, H., Kikuchi, D., Sato, H., & Zheng, G. Q. (2008). Sb-NQR study of PrOs4Sb12 under high pressure. journal of the physical society of japan, 77(SUPPL.A), 330-332. https://doi.org/10.1143/JPSJS.77SA.330