Field induced phases in a heavy fermion U Ru0.92Rh0.08 2 Si 2 single crystal

We report the high field induced magnetic phases and phase diagram of a high quality U Ru0.92Rh0.08 2Si2 single crystal prepared using a modified Czochralski method. Our paper, that combines high field magnetization and electrical resistivity measurements, shows for fields applied along the c axis direction three fieldinduced magnetic phase transitions at amp; 956;0Hc1 21.60, amp; 956;0Hc2 37.90, and amp; 956;0Hc3 38.25 T, respectively. In agreement with a microscopic up up down arrangement of the U magnetic moments the phase above Hc1 has a magnetization of about one third of the saturated value. In contrast the phase between Hc2 and Hc3 has a magnetization that is a factor of 2 lower than above the Hc3 where a polarized Fermi liquid state with a saturated moment Ms amp; 8776; 2.1 amp; 956;B U is realized. Most of the respective transitions are reflected in the electrical resistivity as sudden drastic changes. Most notably, the phase between Hc1 and Hc2 exhibits substantially larger values. As the temperature increases, transitions smear out and disappear above amp; 8776;15 K. However, a substantial magnetoresistance is observed even at temperatures as high as 80 K. Due to a strong uniaxial magnetocrystalline anisotropy, a very small field effect is observed for fields applied perpendicular to the c axis directio