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

Hironori Sakai, Yo Tokunaga, Tatsuya Fujimoto, Shinsaku Kambe, Russell E. Walstedt, Hiroshi Yasuoka, Dai Aoki, Yoshiya Homma, Etsuji Yamamoto, Akio Nakamura, Yoshinobu Shiokawa, Kunihisa Nakajima, Yasuo Arai, Tatsuma D. Matsuda, Yoshinori Haga, Yoshichika Onuki

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)


69,71Ga NMR/NQR studies have been performed on a single crystal of the transuranium superconductor PuRhGa5 with Tc ≃ 9 K. We have observed a 69Ga NQR line at ≃ 29.15 MHz, and assigned it to the 4i Ga site using the NMR results. The 69Ga NQR spin-lattice relaxation rate 1/T1 shows no coherence peak just below Tc, but obeys T3 behavior below Tc. This result strongly suggests that PuRhGa5 is an unconventional superconductor having an anisotropic superconducting gap. The gap amplitude 2Δ0(T → 0) ≃ 5kBTc and the residual density of states Nres(T = 0)/N0(T = T c) ≃ 0.25 have been determined assuming a simple polar function of the form Δ(θ, φ) = A0 cos θ where θ and φ are angular parameters on the Fermi surface.

Original languageEnglish
Pages (from-to)1710-1713
Number of pages4
Journaljournal of the physical society of japan
Issue number6
Publication statusPublished - 2005 Jun


  • Ga NQR
  • PuRhGa
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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