Magnetism and fine electronic structure of UPd2Al3 and NpPd2Al3
R.J. Radwanski, Z. Ropka
TL;DR
This paper investigates the electronic structure and magnetism of UPd2Al3 and NpPd2Al3, confirming the U3+ configuration and deriving crystal-field parameters that explain experimental observations.
Contribution
It introduces a detailed crystal-field model for UPd2Al3 and NpPd2Al3, supporting the U3+ and Np3+ configurations and explaining magnetic properties.
Findings
U3+ configuration in UPd2Al3 confirmed
Derived crystal-field parameters match INS data
Estimated uranium magnetic moment at 0 K is 1.7-1.8 μB
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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