Single crystal study of layered U$_{n}$RhIn$_{3n+2}$ materials: case of the novel U$_{2}$RhIn$_{8}$ compound

Attila Bartha; Marie Kratochvílová; Michal Dušek; Martin Diviš; Jeroen Custers; Vladimír Sechovský

doi:10.1016/j.jmmm.2015.01.015

paper

Single crystal study of layered U $_{n}$ RhIn $_{3 n + 2}$ materials: case of the novel U $_{2}$ RhIn $_{8}$ compound

arXiv:1501.02154 · doi:10.1016/j.jmmm.2015.01.015

Abstract

We report on the single crystal properties of the novel U $_{2}$ RhIn $_{8}$ compound studied in the context of parent URhIn $_{5}$ and UIn $_{3}$ systems. The compounds were prepared by In self-flux method. U $_{2}$ RhIn $_{8}$ adopts the Ho $_{2}$ CoGa $_{8}$ -type structure with lattice parameters a $= 4.6056 (6)$ Å and c $= 11.9911 (15)$ Å. The behavior of U $_{2}$ RhIn $_{8}$ strongly resembles that of the related URhIn $_{5}$ and UIn $_{3}$ with respect to magnetization, specific heat and resistivity except for magnetocrystalline anisotropy developing with lowering dimensionality in the series UIn $_{3}$ vs. U $_{2}$ RhIn $_{8}$ and URhIn $_{5}$ . U $_{2}$ RhIn $_{8}$ orders antiferromagnetically below T $_{N}$ $= 117$ K and exhibits a slightly enhanced Sommerfeld coefficient $γ = 47$ mJ $\cdot$ mol $^{- 1} \cdot$ K $^{- 2}$ . Magnetic field leaves the value of Néel temperature for both URhIn $_{5}$ and U $_{2}$ RhIn $_{8}$ unaffected up to 9 T. On the other hand, T $_{N}$ is increasing with applying hydrostatic pressure up to 3.2 GPa. The weak temperature dependence of $χ (T)$ in all studied compounds might be attributed to the mainly itinerant nature of 5f electrons. The character of uranium 5f electron states of U $_{2}$ RhIn $_{8}$ was studied by first principles calculations based on the density functional theory. The overall phase diagram of U $_{2}$ RhIn $_{8}$ is discussed in the context of magnetism in the related URhX $_{5}$ and UX $_{3}$ (X = In, Ga) compounds.

Single crystal study of layered U $_{n}$ RhIn $_{3 n + 2}$ materials: case of the novel U $_{2}$ RhIn $_{8}$ compound

Abstract

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Single crystal study of layered Un​RhIn3n+2​ materials: case of the novel U2​RhIn8​ compound

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Single crystal study of layered U $_{n}$ RhIn $_{3 n + 2}$ materials: case of the novel U $_{2}$ RhIn $_{8}$ compound