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Haga, Yoshinori; Aoki, Dai*; Yamagami, Hiroshi*; Matsuda, Tatsuma; Nakajima, Kunihisa; Arai, Yasuo; Yamamoto, Etsuji; Nakamura, Akio; Homma, Yoshiya*; Shiokawa, Yoshinobu*; et al.
Journal of the Physical Society of Japan, 75(Suppl.), p.4 - 9, 2006/08
Times Cited Count：0 Percentile：0.00(Physics, Multidisciplinary)The discovery of the high-temperature in PuCoGa
and PuRhGa promoted us to extend our research to other actinide compounds. We recently succeeded in growing single crystals of PuRhGa and performed magnetic measurements and NMR study both in the normal and superconducting states in collaboration with Tohoku university. The magnetic susceptibility consists of Curie-Weiss and temperature-independent terms where the former corresponds to the paramagnetic effective moment close to the 5
configuration. On the other hand, the superconducting upper critical field is anisotropic. It is explained by the anisotropic mass model with an effective mass ratio of 4, indicating the presence of quasi-two-dimensional Fermi surfaces. These characteristics are reminiscent of those observed in CeCoIn.
and anistropic superconducting propertiesHaga, Yoshinori; Sakai, Hironori; Matsuda, Tatsuma; Tokunaga, Yo; Fujimoto, Tatsuya; Kambe, Shinsaku; Yamamoto, Etsuji; Nakamura, Akio; Walstedt, R. E.; Yasuoka, Hiroshi; et al.
Kotai Butsuri, 40(7), p.519 - 526, 2005/07
Single crystals of the plutonium-based superconductor PuRhGa have been successufully grown. The anisotropic superconducting properties were investigated by magnetization and Ga-NQR measurements. Large anisotropy of the upper critical field and the presence of line nodes on the Fermi surface were revealed, indicating the quasi-two-dimensional electronic state as well as the magnetically mediated superconductivity.
Haga, Yoshinori; Aoki, Dai*; Matsuda, Tatsuma; Nakajima, Kunihisa; Arai, Yasuo; Yamamoto, Etsuji; Nakamura, Akio; Homma, Yoshiya*; Shiokawa, Yoshinobu; Onuki, Yoshichika
Journal of the Physical Society of Japan, 74(6), p.1698 - 1701, 2005/06
Times Cited Count：46 Percentile：81.92(Physics, Multidisciplinary)Single crystals of Pu-based superconductor PuRhGa have been successfully grown. Magnetization and AC susceptibility measurements were performed to investigate anisotropic magnetic and superconducting properties. Although the paramagnetic susceptibility in the normal state is isotropic, large anisotropy in the superconducting upper critical field is observed. This suggests that the effective mass of the conduction electrons along [001] is 4 times larger than that for [100].
