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

doi:10.1143/JPSJ.74.1710

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

Materials Processing and Characterization Division

Research output: Contribution to journal › Article

79 Citations (Scopus)

Abstract

^69,71Ga NMR/NQR studies have been performed on a single crystal of the transuranium superconductor PuRhGa₅ with T_c ≃ 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 T_c, but obeys T³ behavior below T_c. This result strongly suggests that PuRhGa₅ is an unconventional superconductor having an anisotropic superconducting gap. The gap amplitude 2Δ₀(T → 0) ≃ 5k_BT_c and the residual density of states N_res(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 language	English
Pages (from-to)	1710-1713
Number of pages	4
Journal	journal of the physical society of japan
Volume	74
Issue number	6
DOIs	https://doi.org/10.1143/JPSJ.74.1710
Publication status	Published - 2005 Jun 1

Keywords

Ga NQR
PuRhGa
Superconductivity

ASJC Scopus subject areas

Physics and Astronomy(all)

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Sakai, H., Tokunaga, Y., Fujimoto, T., Kambe, S., Walstedt, R. E., Yasuoka, H., Aoki, D., Homma, Y., Yamamoto, E., Nakamura, A., Shiokawa, Y., Nakajima, K., Arai, Y., Matsuda, T. D., Haga, Y., & Onuki, Y. (2005). Anisotropic superconducting gap in transuranium superconductor PuRhGa ₅: Ga NQR study on a single crystal. journal of the physical society of japan, 74(6), 1710-1713. https://doi.org/10.1143/JPSJ.74.1710

Anisotropic superconducting gap in transuranium superconductor PuRhGa ₅ : Ga NQR study on a single crystal. / Sakai, Hironori; Tokunaga, Yo; Fujimoto, Tatsuya; Kambe, Shinsaku; Walstedt, Russell E.; Yasuoka, Hiroshi; Aoki, Dai ; Homma, Yoshiya; Yamamoto, Etsuji; Nakamura, Akio; Shiokawa, Yoshinobu; Nakajima, Kunihisa; Arai, Yasuo; Matsuda, Tatsuma D.; Haga, Yoshinori; Onuki, Yoshichika.

In: journal of the physical society of japan, Vol. 74, No. 6, 01.06.2005, p. 1710-1713.

Research output: Contribution to journal › Article

Sakai, H, Tokunaga, Y, Fujimoto, T, Kambe, S, Walstedt, RE, Yasuoka, H, Aoki, D , Homma, Y, Yamamoto, E, Nakamura, A, Shiokawa, Y, Nakajima, K, Arai, Y, Matsuda, TD, Haga, Y & Onuki, Y 2005, 'Anisotropic superconducting gap in transuranium superconductor PuRhGa ₅: Ga NQR study on a single crystal', journal of the physical society of japan, vol. 74, no. 6, pp. 1710-1713. https://doi.org/10.1143/JPSJ.74.1710

Sakai, Hironori ; Tokunaga, Yo ; Fujimoto, Tatsuya ; Kambe, Shinsaku ; Walstedt, Russell E. ; Yasuoka, Hiroshi ; Aoki, Dai ; Homma, Yoshiya ; Yamamoto, Etsuji ; Nakamura, Akio ; Shiokawa, Yoshinobu ; Nakajima, Kunihisa ; Arai, Yasuo ; Matsuda, Tatsuma D. ; Haga, Yoshinori ; Onuki, Yoshichika. / Anisotropic superconducting gap in transuranium superconductor PuRhGa ₅ : Ga NQR study on a single crystal. In: journal of the physical society of japan. 2005 ; Vol. 74, No. 6. pp. 1710-1713.

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

abstract = "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.",

keywords = "Ga NQR, PuRhGa, Superconductivity",

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

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T2 - Ga NQR study on a single crystal

AU - Sakai, Hironori

AU - Tokunaga, Yo

AU - Fujimoto, Tatsuya

AU - Kambe, Shinsaku

AU - Walstedt, Russell E.

AU - Yasuoka, Hiroshi

AU - Aoki, Dai

AU - Homma, Yoshiya

AU - Yamamoto, Etsuji

AU - Nakamura, Akio

AU - Shiokawa, Yoshinobu

AU - Nakajima, Kunihisa

AU - Arai, Yasuo

AU - Matsuda, Tatsuma D.

AU - Haga, Yoshinori

AU - Onuki, Yoshichika

PY - 2005/6/1

Y1 - 2005/6/1

N2 - 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.

AB - 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.

KW - Ga NQR

KW - PuRhGa

KW - Superconductivity

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