Abstract
A single crystal of uranium ternary intermetallic compound UPdGa5 was grown by the Ga self-flux method. The magnetic susceptibility showed a weak temperature dependence and small anisotropy, consistent with an itinerant character of 5f electrons. We observed a clear drop in the susceptibility and electrical resistivity below the Néel temperature TN=31 K. The magnetic structure was studied by means of a neutron diffraction measurement. We observed an antiferromagnetic peak with the propagation vector Q=[0,0,1⁄2]. The uranium 5f moment of 0.33(4)μB/U parallel to the c-axis was found to order ferromagnetically in the basal c-plane and coupled antiferromagnetically along the c-axis.
