Microscopic Properties of the Heavy-Fermion Superconductor PuCoIn${}_5$ Explored by Nuclear Quadrupole Resonance

Abstract

We report ${}^{115}$In nuclear quadrupolar resonance (NQR) measurements on the heavy-fermion superconductor PuCoIn${}_5$, in the temperature range $0.29\mathrm{K}\le T\le 75\mathrm{K}$. The NQR parameters for the two crystallographically inequivalent In sites are determined, and their temperature dependence is investigated. A linear shift of the quadrupolar frequency with lowering temperature below the critical value $T_c$ is revealed, in agreement with the prediction for composite pairing. The nuclear spin-lattice relaxation rate $T_1^{-1}(T)$ clearly signals a superconducting (SC) phase transition at $T_c\simeq 2.3$K, with strong spin fluctuations, mostly in-plane, dominating the relaxation process in the normal state near to $T_c$. Analysis of the $T_1^{-1}$ data in the SC state suggests that PuCoIn${}_5$ is a strong-coupling $d$-wave superconductor.

12 pages, 5 figures

References in corpus (3)

• Heavy electrons and the symplectic symmetry of spin
• Supplementary material to Heavy electrons and the symplectic symmetry of spin
• Anisotropic spin fluctuations and superconductivity in "115'' heavy fermion compounds: 59Co NMR study in PuCoGa5

Cited by in corpus (3)

• Plutonium-Based Heavy-Fermion Systems
• Extended Nuclear Quadrupole Resonance Study of the Heavy-Fermion Superconductor PuCoGa${}_5$
• Spins, electrons and broken symmetries: realizations of two channel Kondo physics