Fermi surfaces and magnetic properties of PuX

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

Plutonium compounds is located at the boundary between itinerant 5f states in the light actinides and the localized 5f states in the heavier actinides. To understand the electronic states, experimental observation of the Fermi surfaces is quite important. Actually we have already shown in a variety of uranium compounds that the 5f electrons in uranium compounds is, in most cases, itinerant. For plutonium compounds, however, experiments are extremely difficult because of its radioactivity. Recently, we have demonstrated that the 5f electrons of a plutonium compound PuIn forms Fermi surfaces with itinerant 5f electrons.