Magnetic phase diagram of UCoAl

UCoAlの磁気相図

松田 達磨; 立岩 尚之   ; 山本 悦嗣  ; 芳賀 芳範   ; 大貫 惇睦; 青木 大*; Flouquet, J.*; Fisk, Z.

Matsuda, Tatsuma; Tateiwa, Naoyuki; Yamamoto, Etsuji; Haga, Yoshinori; Onuki, Yoshichika; Aoki, Dai*; Flouquet, J.*; Fisk, Z.

Heavy fermion UCoAl is known to be a unique system with metamagnetic transition from paramagnetic to ferromagnetic ground state in uranium-based compounds. These kinds of metamagnetism and quantum criticality in strongly correlated electron systems have attracted much attention because of expectation of new quantum phases. Recently, we succeeded to grow a high quality single crystal of UCoAl by the Czochralski pulling method and performed the magnetic measurements. We present the magnetic phase diagram of UCoAl in detail.