Anisotropic superconducting gap in transuranium superconductor PuRhGa$_{5}$: Ga NQR study on a single crystal
H. Sakai, Y. Tokunaga, T. Fujimoto, S. Kambe, R. E. Walstedt, H., Yasuoka, D. Aoki, Y. Homma, E. Yamamoto, A. Nakamura, Y. Shiokawa, K., Nakajima, Y. Arai, T. D. Matsuda, Y. Haga, and Y. Onuki
TL;DR
This study uses Ga NQR techniques on a single crystal of PuRhGa₅ to reveal an anisotropic, unconventional superconducting gap with no coherence peak, indicating complex pairing mechanisms.
Contribution
It provides the first NQR evidence of an anisotropic gap in PuRhGa₅, highlighting its unconventional superconducting nature.
Findings
No coherence peak in 1/T₁ below Tc
T³ behavior of 1/T₁ indicates anisotropic gap
Identified Ga site using NMR results
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 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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