Abstract The electronic state of UPd 2 Cd 20 , which exhibits a magnetic transition at T N ∼5 K, is investigated by means of transport, high-field magnetization up to 55 T, specific heat in magnetic fields, and de Haas-van Alphen (dHvA) measurements, and compared with the non-5f compound ThPd 2 Cd 20 . A metamagnetic transition is observed at µ 0 H c ∼ 15 -20 T, which continuously connects to T N in the H -T phase diagram. Although the magnetization reaches large values at high fields reminiscent of 5f localized character, the ordered magnetic moment is estimated to be small, as inferred from the weak anomalies in specific heat at T N and in magnetization at H c , suggesting an itinerant character of the 5f electrons. The observed dHvA frequencies reveal enhanced cyclotron effective masses of 30 m 0 , which are much heavier than those in ThPd 2 Cd 20 . These experimental results indicate that 5f -derived bands contribute to the large electronic specific heat coefficient of 670 mJ/(K 2 •mol), demonstrating the dual localized-itinerant character of 5f electrons in UPd 2 Cd 20
Hirose et al. (Tue,) studied this question.