Single crystal growth, superconductivity and Fermi surface study of plutonium compounds

Haga, Yoshinori   ; Aoki, Dai*; Yamagami, Hiroshi*; Matsuda, Tatsuma; Nakajima, Kunihisa  ; Arai, Yasuo; Yamamoto, Etsuji  ; Nakamura, Akio; Homma, Yoshiya*; Shiokawa, Yoshinobu*; Onuki, Yoshichika

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.