Evidence for Point Nodes in the Superconducting Gap Function in the Filled Skutterudite Heavy-Fermion Compound PrOs4Sb12: 123Sb-NQR Study under Pressure
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We report 123Sb nuclear quadrupole resonance (NQR) measurements of the filled skutterudite heavy-fermion superconductor PrOs4Sb12 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 $\Delta_{\text{CEF}}$ between the ground state $\Gamma_{1}$ singlet and the first excited state $\Gamma_{4}^{(2)}$ triplet decreases with increasing pressure. The $1/T_{1}$ below $T_{\text{c}} = 1.55$ K at $P = 1.91$ GPa shows a power-law temperature variation and is proportional to $T^{5}$ at temperatures considerably below $T_{\text{c}}$, which indicates the existence of point nodes in the superconducting gap function. The data can be well fitted by the gap model $\Delta(\theta) = \Delta_{0}\sin\theta$ with $\Delta_{0} = 3.08k_{\text{B}}T_{\text{c}}$. The relation between the superconductivity and the quadrupole fluctuations associated with the $\Gamma_{4}^{(2)}$ state is discussed.
- 2007-02-15
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