Physical and Structural Properties of Ternary Uranium Compounds in the U–Ni–Sn and U–Ni–In Systems

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  • Physical and Structural Properties of T

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New ternary uranium compounds of UNi2Sn and UNi2In have been prepared and found to crystallize in the MgCu2Al-type structure. On these compounds and UNi4Sn, UNi4In and U3Ni3Sn4 with cubic structures, we report the results of electrical resistivity, thermoelectric power, magnetic susceptibility and specific heat measurements. Of the five compounds, only U3Ni3Sn4 exhibits a moderately heavy-fermion behavior at low temperatures. The other four compounds, where the distance between the U atom and the nearest-neighboring Ni atom is almost the same as in U3Ni3Sn4, are, however, enhanced Pauli paramagnets. No compounds show magnetic or superconducting transition down to 1.6 K.

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