Magnetism and fine electronic structure of UPd2Al3 and NpPd2Al3
Abstract
We claim the existence of the f3 (U3+) configuration in UPd2Al3. It is in agreement with inelastic-neutron-scattering (INS) excitations and is consistent with the trivalent neptunium configuration in NpPd2Al3. We have derived set of CEF parameters for the U3+ state that reproduces the INS excitations and temperature dependence of the heat capacity. On basis of the crystal-field theory, extended to Quantum Atomistic Solid State Theory we argue that the magnetic moment of the uranium moment amounts at 0 K to 1.7-1.8 muB. Keywords: Crystalline Electric Field, Heavy fermion magnetism, UPd2Al3, NpPd2Al3 PACS: 71.70.E, 75.10.D
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