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Abstract:
Using Np-237 Mossbauer spectroscopy [1) on NpPd2Al3 a second-order
magnetic transition was found at 38K. At low temperatures the hyperfine
spectrum consists of an overlay of three magnetic patterns indicating a
(squared) modulated structure, The ordered moment on Np is 1.67 muB. A
tetravalent charge state for Np is deduced. Our results are compared
with data on the heavy-fermion compound UPd2Al3.