Magnetic phase diagram of UCoAl

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.