Single-crystalline UGe${}_{2}$ was investigated by means of magnetic susceptibility, magnetization, electrical resistivity, magnetoresistivity, and specific-heat measurements, all carried out in wide temperature magnetic-field ranges. An analysis the obtained data points dual behavior 5$f$ electrons this compound, i.e., possessing simultaneously local itinerant characters two substates. The thermal characteristics compound were modeled using effective crystal field (CF) intermediate coupling...

Single-crystalline ${\text{CeRh}}_{3}{\text{Si}}_{2}$ was investigated by means of x-ray diffraction, magnetic susceptibility, magnetization, electrical resistivity, and specific-heat measurements carried out in wide temperature field ranges. Moreover, the electronic structure compound studied at room cerium core-level photoemission spectroscopy (XPS). The physical properties were analyzed terms crystalline electric compared with results ab initio band-structure calculations performed within...

Optical absorption measurements of Nd(3+) ions in single crystals [Nd(hfa)(4)(H(2)O)](N(C(2)H(5))(4)) (hfa = hexafluoroacetyloacetonate), denoted Nd(hfa) for short, have been carried out at 4.2 and 298 K. This compound crystallizes the monoclinic system (space group P 2(1)/n). Each Nd ion is coordinated to eight oxygen atoms that originate from hexafluoroacetylacetonate ligands one atom water molecule. A total 85 experimental crystal-field (CF) energy levels arising (4f(3)) electronic...

Absorption, emission, and excitation spectra covering a wide energy range of 3000−58000 cm−1 for the Eu3+ ion in low symmetry system K5Li2EuF10 have been reported. The emission analyzed by taking into account influence temperature onto luminescence from 5D0,1,2 multiplets. observed intervals transition bands characteristic europium assigned modeled using multistep approach developed this system. A risk producing numerical artifacts multidimensional parameter space has minimized its strong...

The transport properties described previously [Tro\ifmmode \acute{c}\else \'{c}\fi{} et al., Phys. Rev. B 85, 224434 (2012)] as well the magnetic and thermal presented in this paper, observed for single-crystalline UCu${}_{2}$Si${}_{2}$, are discussed by assuming a dual (localized-itinerant) scenario. electronic states of localized 5$f$ electrons UCu${}_{2}$Si${}_{2}$ constructed using effective Hamiltonian known ionic systems, allowing us to treat Coulomb, spin-orbital, crystal-field...

The valence and core-level x-ray photoemission spectra (XPS), performed on an $\mathrm{UF}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{l}}_{10}$ single crystal, were measured using the Al K\ensuremath{\alpha} radiation. results of XPS show practically two separate regions spectral intensity, one just at Fermi level $({E}_{\mathrm{F}})$ other being a wide content with its maximum about $0.8\phantom{\rule{0.16em}{0ex}}\mathrm{eV}$ below ${E}_{\mathrm{F}}$. These give rise to electronic configurations...

Both the fundamental assumptions of angular overlap model (AOM) and its common simplifications are shown to have a sound basis in ab initio calculations crystal-field effect uranium (III), (IV), (V), neptunium (IV) plutonium ions various crystals. The traditional sigma - pi approach is confirmed as well-aimed initial step towards an interpretation effect. specific role delta -contribution important lattice-dependent correction indicates necessity inclusion model. practical two-step method...

An efficient method of interpretation the crystal field effect in non-metallic f-electron systems, {\it enhanced angular overlap model} (EAOM), is presented. The established on ground perturbation expansion effective Hamiltonian for localized electrons and first principles calculations related to available experimental data. Series actinide compounds, $An$O$_2$, oxychalcogenides, $An$O$X$ dichalcogenides U$X_2$ where $X$ = S, Se, Te $An$ U, Np serve as a probe effectiveness proposed method....

A consistent description of the electronic structure U4+ (5f2 ) ion in UOY (Y = S, Se, Te) compounds derived on basis a model first-principles calculation is presented. The crystal field potential discussed detail. Special attention paid to contributions non-equivalent ligand groups. Their competition and variation along series explain apparently random total values parameters (CFPs). Discussion an interplay factors dependent coordination geometry so called `intrinsic parameters' describing...

High resolution absorption spectra of a U3+(0.3%) : Ba2YCl7 single crystal were recorded in the 4000–50 000 cm−1 range at 7 K. The observed crystal-field levels assigned and fit to parameters simplified angular overlap model (AOM) as well semi-empirical Hamiltonian representing combined atomic one-electron interactions. starting values AOM obtained from ab intio calculations. analysis allowed assignment 65 with relatively small rms deviation 25 has shown that approach can predict quite Bkq...

A simple formula describing the influence of crystalline electric field free‐ion excitations on temperature dependence contribution s–f scattering to thermal resistivity normal rare‐earth metals is presented. The corresponding for electrical also given and compared one being currently used. Theoretical electron–phonon contributions derived in earlier papers constant impurity are added formulae order fit total represented as functions experimental dependences DyIn this way manifest...

Visible and infrared absorption measurements on the ion in tetragonal zircon-type matrix are reported analysed terms of standard parametrization scheme. The observed 17 main peaks a number less intense lines have been assigned fitted to most 32 allowed electric dipole transitions with root mean square error equal . free-ion parameters obtained for model Hamiltonian, , as well corresponding crystal-field parameters, agree fairly initial theoretical estimations. results discussed relation...