Prokes, K.; Förster, T.; Huang, Y.K.; Mydosh, J.A.: Field-induced phases in a heavy-fermion U(Ru0.92Rh0.08)2Si2 single crystal. Physical Review B 99 (2019), p. 045104/1-8
10.1103/PhysRevB.99.045104
Open Access Version
Abstract:
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 μ0Hc1 = 21.60, μ0Hc2 = 37.90, and μ0Hc3 = 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 ≈ 2.1μB/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 ≈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 direction.