Electrical and magnetic properties in NpTGa (T=Fe, Co, Ni)

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

We succeeded in growing a high-quality single crystal of NpTGa (T=Fe, Co, Ni) with the tetragonal structure by the Ga-flux method and measured the electrical resistivity, magnetic susceptibility and magnetization. NpFeGa and NpCoGa are antiferromagnets with a Nel temperature of 116 K and 47 K, respectively. On the other hand, NpNiGa orders ferromagnetically below 30 K, but changes into another magnetic state with an antiferromagnetic character at 18 K.