- Bc. Atilla Bartha: Physical properties of UnRhIn3n+2 (n = 1, 2) - tetragonal compounds with layered structure
- 5. 3. 2014, 14:30
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
We report on thermodynamic, magnetization and transport properties of U2RhIn8 compound. Single crystals have been synthesized for the first time using In self-flux method. The compound adopts the Ho2CoGa8-type structure with lattice parameters a = 4.6163 Å and c = 12.0144 Å. In contrast to its nonmagnetic counterpart U2RhGa8 [1], U2RhIn8 undergoes an antiferromagnetic phase transition at TN = 117 K with slightly enhanced Sommerfeld coefficient of 47 mJ*mol-1*K-2. The behavior of U2RhIn8 strongly resembles the properties of related URhIn5 and UIn3 systems [2] with respect to the magnetization and resistivity measurements. Magnetic susceptibility reveals strongly anisotropic properties with effective moment corresponding roughly to the free uranium ion. Additionally, an unusually large Curie temperature is found, reaching almost -800 K for H || a and -230 K for H || c. This weak temperature dependence of susceptibility might be attributed to the partly itinerant nature of 5f electrons. While magnetic field leaves the evolution of TN unaffected up to 14 T, it is enhanced upon applying hydrostatic pressure. The overall phase diagram will be discussed in the context of magnetism in related URhX5 and UX3 (X = In, Ga) [2, 3] compounds.
[1] S. Ikeda et al., J. Phys.: Condens. Matter 15 (2003) S2015-S2018
[2] Y. Matsumoto et al.: Phys. Rev. B 88, 045120 (2013) and references therein
[3] D. Kaczorowski et al., Physica B 230-232 (1997) 35-38