Evidence for Point Nodes in the Superconducting Gap Function in the Filled Skutterudite Heavy-Fermion Compound PrOs4Sb12: 123Sb-NQR Study under Pressure

Simple item page
dc.creatorKatayama, Kouta
dc.creatorKawasaki, Shinji
dc.creatorNishiyama, Masahide
dc.creatorSugawara, Hitoshi
dc.creatorKikuchi, Daisuke
dc.creatorSato, Hideyuki
dc.creatorZheng, Guo-qing
dc.date2007-01-25
dc.date.accessioned2026-07-07T07:42:58Z
dc.date.available2026-07-07T07:42:58Z
dc.descriptionWe report $^{123}$Sb nuclear quadrupole resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs$_4$Sb$_{12}$ under high pressures of 1.91 and 2.34 GPa. The temperature dependence of NQR frequency and the spin-lattice relaxation rate $1/T_1$ indicate that the crystal-electric-field splitting $Δ_{\rm CEF}$ between the ground state $Γ_1$ singlet and the first excited state $Γ_4^{(2)}$ triplet decreases with increasing pressure. The 1/$T_1$ below $T_c$ = 1.55 K at $P$ = 1.91 GPa shows a power-law temperature variation and is proportional to $T^5$ at temperatures considerably below $T_c$, which indicates the existence of point nodes in the superconducting gap function. The data can be well fitted by the gap model $Δ(θ)=Δ_0\sinθ$ with $Δ_0$ = 3.08$k_{\rm B}T_{\rm c}$. The relation between the superconductivity and the quadrupole fluctuations associated with the $Γ_4^{(2)}$ state is discussed.
dc.description4pages, 4figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0701613
dc.identifierhttp://arxiv.org/abs/cond-mat/0701613
dc.identifierJ. Phys. Soc. Jpn., 76, 023701 (2007)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/122645
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleEvidence for Point Nodes in the Superconducting Gap Function in the Filled Skutterudite Heavy-Fermion Compound PrOs4Sb12: 123Sb-NQR Study under Pressure
dc.typetext

Files

Collections

arXiv