ENDOR and transferred spin densities of the 4f<sup>11</sup>ions in fluorides

Anikeenok, O. A.; Erëmin, M. V.; Falin, M. L.; Konkin, A. A.; Meiklyar, V. P.

doi:10.1088/0022-3719/17/15/017

Cited by 31 publications

(20 citation statements)

References 17 publications

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“…6). The theoretical evaluation of the THFI parameters was based on the mechanisms of bonding IREI-ligands developed in [1][2][3][4][5]. The Ag"'> were not calculated theoretically because numerical data on the Stark structure of the H 1512 term in the octahedral crystalline field were absent.…”

Section: Analysis and Discussionmentioning

confidence: 99%

“…The theory developed in [1][2][3][4][5] enabled us to take into account in a simple way the contribution to THFI due to polarization of the 5s and 5p shells of IREI not only for the S-state ions (4f' -Gd= ' + , Eu2 +), but, for the first time, also for other configurations as well (4f" -Era [4,6], 4f 13 -Yb3 + [ 6,7]). An important aspect in the theoretical description of the experimental results of THFI is the determination of the actual distances between the IREI and the ligands.…”

Section: Introductionmentioning

confidence: 99%

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Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

et al. 1998

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ENDOR measurements on the 19F -nuclei in the first four shells of KZnF 3 containing Dy'+ ions in the cubic site are reported. The values and signs of the hyperfine and transferred hyperfine interaction parameters are determined. The local deformation of the crystal lattice in the vicinity of the impurity ion is estimated. The theoretical analysis of the THFI parameters for the first coordination shell of the F -ions has been carried out. For the Dy3 + ion the influence of spin polarization of the closed 5s and 5p shells is considered for the first time. Spin polarization is shown to play a significant role in the mechanisms of rare-earth ion-ligand coupling.

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Section: Analysis and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

et al. 1998

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“…[6] or Fig. 3 in Ref [7]). Until now, no theoretical calculations, particularly those associated with the rhombic distortions for the g factors of Cu 2?…”

Section: Introductionmentioning

confidence: 97%

“…The density functional theory (DFT) calculations showed that the compressed CuF 6 4-octahedra in these layered perovskites are not due to the Jahn-Teller effect, but due to the anisotropic electric field created by the rest of lattice ions of the non-cubic lattice on the complex [4,5]. The electron paramagnetic resonance (EPR) experiments [6,7] for Cu 2? centers in K 2 ZnF 4 (i.e., K 2 Zn 1-x octahedra in other crystals, the g // is significantly greater than the value predicted by the theory based on the ground state jd z 2[ , so these g factors for the tetragonally compressed Cu 2?…”

Section: Introductionmentioning

confidence: 99%

“…centers in K 2 ZnF 4 (i.e., K 2 Zn 1-x octahedra in other crystals, the g // is significantly greater than the value predicted by the theory based on the ground state jd z 2[ , so these g factors for the tetragonally compressed Cu 2? octahedra in crystals are explained in terms of the vibronic coupling between the ground state jd z 2[ and an appropriate excited state jd x 2 Ày 2[ [3,[6][7][8]. The rhombic distortions of Cu 2?…”

Section: Introductionmentioning

confidence: 99%

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Investigations of EPR g Factors and Rhombic Distortion for the Rhombic Cu2+ Centers in K2Zn1−x Cu x F4 Crystals at Low Temperature

Zheng

Zhang

et al. 2012

Appl Magn Reson

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The electron paramagnetic resonance g factors g i (i = x, y, z) of two rhombic Cu 2? centers, Cu 2? (II) and Cu 2? (III), in K 2 Zn 1-x Cu x F 4 crystals found at low temperature are calculated from the complete diagonalization (of energy matrix) method based on the cluster approach. The calculations show that the ground state wave function of the two rhombically compressed Cu 2? centers is jd z 2[ with a small admixture of jd x 2 Ày 2[ . The rhombic distortions for both Cu 2? centers are obtained from the calculations. The results are discussed.

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Ligand hyperfine interaction and lattice distortion‐for cubic Er³⁺ centers in BaF₂

Kiknadze

Mirianashvili

Sanadze

1989

Physica Status Solidi (b)

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Comparison of the ligand HFI data for some rare-earth ions in various alkaline-earth ions in various alkaline-earth fluorides is useful from many points of view. Particularly, in the case of cubic symmetry magnetic centers, this comparison allows to estimate the distortion of the immediate vicinity of the magnetic ion, which cannot be determined directly due to the considerable covalent contribution in the first fluorine shell HFI constants.The a i m of our note was the measurement of ligand HFI constants for cubic Er3+ centers in BaF in order to compare them with those measured for cubic Er3+ in CaF2 /1/.BaF2: Er3+ single crystals were studied by the radio-frequency discrete saturation (RFDS) method / 2 / (pulse analogue of ENDOR). The experiments were carried out on the X-band RFDS spectrometer at 4.2 K . The samples (impurity concentration about 0.01%) were grown by the BridgmanStockbarger technique. Most of the impurity ions were found in trigonal sites /31. Only 2% of Er3+ form the cubic EPR spectrum with g = 6.761 (21. 2The angular dependence of the ligand RFDS spectrum was studied (Fig. 1). Only the first fluorine shell frequencies were observed. The resonance frequencies were described by the standard axial spin-Hamiltonian . The ligand pseudonuclearZeeman interaction and the second-order corrections, quadratic in ligand HFI, have been taken into account. Measured values of the ligand HFI constants and the pseudonuclear corrections for BaFZ:Er3+ /1/ are given in Table 1.In order to determine the location of neighbouring fluorine ions, we have used Baberschke's suggestion 141, that for certain rare-earth ions in different lattices the covalent contribution A' in A linearly depends on A P P s 'A' = A -A~ = const A~ ; P P 1) Prospekt Chavchawadze 1, SU-380028 Tbilisi, U S S R .

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ENDOR and transferred spin densities of the 4f¹¹ions in fluorides

Cited by 31 publications

References 17 publications

Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

Investigations of EPR g Factors and Rhombic Distortion for the Rhombic Cu2+ Centers in K2Zn1−x Cu x F4 Crystals at Low Temperature

Ligand hyperfine interaction and lattice distortion‐for cubic Er³⁺ centers in BaF₂

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ENDOR and transferred spin densities of the 4f11ions in fluorides

Cited by 31 publications

References 17 publications

Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

Electron nuclear double resonance of the cubic Dy3+ center in the KZnF3 single crystal

Investigations of EPR g Factors and Rhombic Distortion for the Rhombic Cu2+ Centers in K2Zn1−x Cu x F4 Crystals at Low Temperature

Ligand hyperfine interaction and lattice distortion‐for cubic Er3+ centers in BaF2

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ENDOR and transferred spin densities of the 4f¹¹ions in fluorides

Ligand hyperfine interaction and lattice distortion‐for cubic Er³⁺ centers in BaF₂