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

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

$$^{69,71}$$Ga NMR/NQR studies have been performed on a single crystal of the transuranium superconductor PuRhGa$$_{5}$$ with $$T_{c}sim 9$$ K. We have observed a $$^{69}$$Ga NQR line at $$sim$$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 $$T_{rm c}$$, but obeys $$T^{3}$$ behavior below $$T_{rm c}$$. This result strongly suggests that PuRhGa$$_{5}$$ is an unconventional superconductor having an anisotropic superconducting gap. The gap amplitude 2$$Delta_{0}(Trightarrow 0)simeq5k_{rm B}T_{rm c}$$ and the residual density of states $$N_{rm res}(T=0)/N_{rm 0}(T=T_{rm c})simeq$$ 0.25 have been determined assuming a simple polar function of the form $$Delta(theta,phi)$$=$$Delta_{0}costheta$$, where $$theta$$ and $$phi$$ are angular parameters on the Fermi surface.

Language

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English

Journal

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Journal of the Physical Society of Japan

Volume

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74

Number

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6

Pages

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p.1710 - 1713

Publication Year/Month

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2005/06

Meeting title

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Held date

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Location (country)

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1143/JPSJ.74.1710

DOI for research data

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Link to research data related to this paper/report.

Keywords

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超伝導; 超ウラン化合物; PuRhGa$$_{5}$$; NMR; NQR; 緩和率; 異方的超伝導

Research Facility

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Press Release

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Article of JAEA R&D Review

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Investigation of New Plutonium-Based Superconductor; Identification of Exotic Superconducting State by Nuclear Magnetic Resonance[/]

Cooperating Institute

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大阪大学; 東北大学金属材料研究所

Accesses

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- Accesses

InCites™

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Percentile:89.69

Category:Physics, Multidisciplinary

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