paper

Field-induced phases in a heavy-fermion U(RuRh)Si single crystal

arXiv:1901.01750 · doi:10.1103/PhysRevB.99.045104

Abstract

We report the high-field induced magnetic phases and phase diagram of a high quality \urxrs~single crystal prepared using a modified Czochralski method. Our study, that combines high-field magnetization and electrical resistivity measurements, shows for fields applied along the -axis direction three field-induced magnetic phase transitions at = 21.60 T, = 37.90 T and = 38.25 T, respectively. In agreement with a microscopic up-up-down arrangement of the U magnetic moments the phase above has a magnetization of about one third of the saturated value. In contrast the phase between and has a magnetization that is a factor of two lower than above the , where a polarized Fermi-liquid state with a saturated moment 2.1 /U is realized. Most of the respective transitions are reflected in the electrical resistivity as sudden drastic changes. Most notably, the phase between and 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 apllied perpendicular to the -axis direction.

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