Three Localized f Electrons in UPd₂Al₃and in UGe₂Intermetallics

Abstract

We have calculated the strength of the excitations between the crystal-field states which are in agreement with inelastic-neutron-scattering results. This agreement confirms the existence in the heavy-fermion superconductor UPd2Al3 the crystal-field electronic structure being the finger-print of the U 3+ ions with three localized f electrons forming strongly-correlated atomic-like quantum system 5f 3 . The ionic integrity and the low-energy crystal-field electronic structure is preserved in this metallic system in the meV scale as has been postulated in the Quantum Atomistic Solid State theory (QUASST). We provide preliminary results with the U 3+ ion in UGe2 showing the ground-state eigenfunction which reproduces the ordered magnetic-moment value of 1.48 µB. This moment is composed from the dominant orbital contribution (2.6 µB) and the opposite spin moment (1.12 µB).

Charge and crystal field electronic states in CeRh2Si2 and Ba2IrO4

“…Later low-energy crystal field states, energies and eigenfunctions, associated with Er 3+ and Nd 3+ ions have been described in conventional ErNi 5 [5] and Nd 2 Fe 14 B [7] intermetallics. An our description of normal-state electronic and magnetic properties of UPd 2 Al 3 [4], above the heavy-fermion and superconducting states (above, say 3 K) with U 3+ ions was later confirmed by experimental discovery of CEF states in inelastic-neutron scattering experiments [13]. The U 3+ ion has the Kramers doublet ground state.…”

“…Description of magnetic and electronic properties of compounds containing 3d-/4f -/5f -openshell atoms has been very vital part of the condensed-matter physics in last fifty years. The interest has been associated with such topics as Mott insulators, NiO [1], FeBr 2 [2] or LaCoO 3 [3], and heavy-fermion anomalous phenomena occuring in intermetallics with Ce, Yb and uranium (UPd 2 Al 3 [4]) atoms. These anomalous properties are very different from classical behavior observed in, e.g.…”

Spin–orbit coupling and magnetism in Sr2CrO4

“…In the following, we will consider the realistic value U = 12 (3 eV) in the energy scale unit |t 1 | = 250 meV and J H /U between 1/10 and 1/6. For the bare SOC, we will consider values up to λ = 0.2 (50 meV) which lie in the realistic range for 3d ions [36][37][38]. However, we will mainly focus on the range λ ≳ 30 meV.…”