Magnetic field induced phenomena in UIrGe in fields applied along the axis

Pospil, J.*; Haga, Yoshinori   ; Kohama, Yoshimitsu*; Miyake, Atsushi*; Kambe, Shinsaku  ; Tateiwa, Naoyuki   ; Valika, M.*; Proschek, P.*; Prokleka, J.*; Sechovsk, V.*; Tokunaga, Masashi*; Kindo, Koichi*; Matsuo, Akira*; Yamamoto, Etsuji  

The metamagnetic transition between the antiferromagnetic and paramagnetic state in UIrGe has been studied at various temperatures by magnetization, heat capacity, and magnetocaloric effect measurements on a single crystal in static and pulsed magnetic fields applied along the orthorhombic axis. The first-order transition is accompanied by a dramatic increase of the Sommerfeld coefficient. A tentative scenario explaining these anomalies by antiferromagnetic correlations or short-range order in the paramagnetic state is discussed.