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

doi:10.1143/JPSJS.77SA.330

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

School of Science

Research output: Contribution to journal › Article › peer-review

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 Δ_CEF between the ground state Γ₁ singlet and the first excited state Γ₄ ⁽²⁾ triplet decreases with increasing pressure. However, it is found Δ_CEF and T_c 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 T_c = 1.55 K at P = 1.91 GPa shows no coherence peak just below T_c and power-law behavior well below T_c 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 language	English
Pages (from-to)	330-332
Number of pages	3
Journal	journal of the physical society of japan
Volume	77
Issue number	SUPPL.A
DOIs	https://doi.org/10.1143/JPSJS.77SA.330
Publication status	Published - Jan 1 2008

Keywords

Nuclear quadrupole resonance
PrOsSb
Pressure
Unconventional superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJS.77SA.330

Cite this

@article{f02a4417dd6a45beb96ecb8016328002,

title = "Sb-NQR study of PrOs4Sb12 under high pressure",

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.",

keywords = "Nuclear quadrupole resonance, PrOsSb, Pressure, Unconventional superconductivity",

author = "Shinji Kawasaki and Kouta Katayama and Masahide Nishiyama and Hisashi Kotegawa and Kobayashi, {Tatsuo C.} and Hitoshi Sugawara and Daisuke Kikuchi and Hideyuki Sato and Zheng, {Guo Qing}",

year = "2008",

month = jan,

day = "1",

doi = "10.1143/JPSJS.77SA.330",

language = "English",

volume = "77",

pages = "330--332",

journal = "journal of the physical society of japan",

issn = "0031-9015",

publisher = "Physical Society of Japan",

number = "SUPPL.A",

}

TY - JOUR

T1 - Sb-NQR study of PrOs4Sb12 under high pressure

AU - Kawasaki, Shinji

AU - Katayama, Kouta

AU - Nishiyama, Masahide

AU - Kotegawa, Hisashi

AU - Kobayashi, Tatsuo C.

AU - Sugawara, Hitoshi

AU - Kikuchi, Daisuke

AU - Sato, Hideyuki

AU - Zheng, Guo Qing

PY - 2008/1/1

Y1 - 2008/1/1

N2 - 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.

AB - 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.

KW - Nuclear quadrupole resonance

KW - PrOsSb

KW - Pressure

KW - Unconventional superconductivity

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