Anisotropic superconducting gap in transuranium superconductor PuRhGa${}_5$: Ga NQR study on a single crystal

Abstract

^{69,71}Ga NMR/NQR studies have been performed on a single crystal of the transuranium superconductor PuRhGa_{5} with Tc ~ 9 K. We have observed a ^{69}Ga NQR line at ~29.15 MHz, and assigned it to the $4i$ Ga site using the NMR results. The ^{69}Ga NQR spin-lattice relaxation rate 1/T_{1} shows no coherence peak just below Tc, but obeys a T^{3} behavior below Tc. This result strongly suggests that PuRhGa_{5} is an unconventional superconductor having an anisotropic superconducting gap.

arXiv comment9 pages, 4 Postscript figures, Note Added in Proof. to be published in J. Phys. Soc. Jpn. Vol. 74 (No.6)

References in corpus (6)

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• Extended Nuclear Quadrupole Resonance Study of the Heavy-Fermion Superconductor PuCoGa${}_5$
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