Abstract
We have grown the uranium compound URhIn${}_{5}$ with the tetragonal HoCoGa${}_{5}$-type by the In self-flux method. In contrast to the nonmagnetic ground state of the isoelectronic analog URhGa${}_{5}$, URhIn${}_{5}$ is an antiferromagnet with antiferromagnetic transition temperature ${T}_{\mathrm{N}}=98$ K. The moderately large electronic specific heat coefficient $\ensuremath{\gamma}=50$ mJ/K${}^{2}$mol demonstrates the contribution of 5$f$ electrons to the conduction band. On the other hand, magnetic susceptibility in the paramagnetic state roughly follows a Curie-Weiss law with a paramagnetic effective moment corresponding to a localized uranium ion. The crossover from localized to itinerant character at low temperature may occur around the characteristic temperature 150 K where the magnetic susceptibility and electrical resistivity show a marked anomaly.
Highlights
Actinide elements and their compounds are characterized by the 5f electrons
In contrast to the nonmagnetic ground state of the isoelectronic analog URhGa5, URhIn5 is an antiferromagnet with antiferromagnetic transition temperature TN = 98 K
Magnetic susceptibility in the paramagnetic state roughly follows a Curie-Weiss law with a paramagnetic effective moment corresponding to a localized uranium ion
Summary
Actinide elements and their compounds are characterized by the 5f electrons. Because of the large spatial extent of the wave functions, 5f electrons are sensitive to the physical or chemical environments surrounding them. It shows successive structural phase transitions with six different crystal structures as a function of temperature.1 Among these structures, cubic δ-phase plutonium (δ-Pu) has about 20% larger unit cell volume than that of the α-phase at room temperature. Recent experimental discovery of the isostructural superconductors PuTX5 (T = Co and Rh, X = Ga and In) with the tetragonal HoCoGa5-type structure has stimulated those discussions.5–8 Actinide elements and their compounds have been extensively studied despite their attendant experimental difficulties. We report an attempt to change the ground state of a 5f electron by changing its relative volume In this context, compounds with the tetragonal HoCoGa5-type (115) structure are suitable because a series of compounds with the same structure widely exist in rare-earth and actinide systems. A magnetic ground state is realized in this compound
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