Anisotropic superconducting gap in transuranium superconductor PuRhGa$_{5}$: Ga NQR study on a single crystal

Details Anisotropic superconducting gap in transuranium superconductor PuRhGa$_{5}$: Ga NQR study on a single crystal Anisotropic superconducting gap in transuranium superconductor PuRhGa$_{5}$: Ga NQR study on a single crystal

2005-04-07

arxiv.org/abs/cond-mat/0504153v1

Physics

Condensed Matter

Superconductivity

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

Scientific paper

10.1143/JPSJ.74.1710

^{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.

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