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Journal Articles

Electronic properties of transuranium compounds with HoCoGa$$_5$$-type tetragonal crystal structure

Maehira, Takahiro*; Hotta, Takashi; Ueda, Kazuo*; Hasegawa, Akira*

New Journal of Physics (Internet), 8(2), p.24_1 - 24_20, 2006/02

https://doi.org/10.1088/1367-2630/8/2/024
 Times Cited Count：16 Percentile：64.61(Physics, Multidisciplinary)

By using a relativistic band-structrue calculation method, we investigate energy band structures and the Fermi surfaces of NpTGa$$_5$$, PuTGa$$_5$$, and AmCoGa$$_5$$ with transition metal atoms T. It is found in common that the energy bands in the vicinity of the Fermi level are mainly due to the large hybridization between $$5f$$ and Ga $$4p$$ electrons. For PuTGa$$_5$$, we observe several cylindrical sheets of Fermi surfaces with large volume for T=Co, Rh, and Ir. It is also found that the Fermi surfaces of NpFeGa$$_5$$, NpCoGa$$_5$$, and NpNiGa$$_5$$ are similar to those of UCoGa$$_5$$, UNiGa$$_5$$, and PuCoGa$$_5$$, respectively, except for small details. For AmCoGa$$_5$$, the Fermi surfaces are found to consist of large cylindrical electron sheets and small closed hole sheets, similar to PuCoGa$$_5$$. The similarity is basically understood by a rigid-band picture.

Journal Articles

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; et al.

Journal of the Physical Society of Japan, 74(6), p.1710 - 1713, 2005/06

https://doi.org/10.1143/JPSJ.74.1710
 Times Cited Count：78 Percentile：90.06(Physics, Multidisciplinary)

$$^{69,71}$$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.

Journal Articles

First observation of the de Haas-van Alphen effect in NpNiGa$$_{5}$$

Aoki, Dai*; Yamamoto, Etsuji; Homma, Yoshiya*; Shiokawa, Yoshinobu; Nakamura, Akio; Haga, Yoshinori; Settai, Rikio*; Onuki, Yoshichika

Journal of the Physical Society of Japan, 73(3), p.519 - 522, 2004/03

https://doi.org/10.1143/JPSJ.73.519
 Times Cited Count：37 Percentile：79.53(Physics, Multidisciplinary)

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