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Tytuł:
Parametrization of the Vibronic Contributions to the b$\text{}\text{}_{4}^{0}$ Spin-Hamiltonian Parameters for $\text{}^{8}$S$\text{}_{7}\text{}_{/}\text{}_{2}$ Ground State Ions in Fluoroperovskites
Autorzy:
Rewaj, T.
Kuriata, J.
Typek, J.
Buzare, J. Y.
Powiązania:
https://bibliotekanauki.pl/articles/1929837.pdf
Data publikacji:
1993-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
Parametrization of phonon induced contributions to the experimentally determined temperature dependence of the b$\text{}_{0}^{4}$ spin-Hamiltonian parameter for Gd$\text{}_{3+}$ doped RbCaF$\text{}_{3}$, CsCaF$\text{}_{3}$, RbCdF$\text{}_{3}$ and TlCdF$\text{}_{3}$ single crystals is discussed. Three physically different parametrization schemes are considered, i.e. that of Einstein, Debye and Huang. It is found that the model of Huang, which predicts that the phonon induced contributions should be proportional to the Debye-Waller factor, describes best the experimental data. The method allowing determination of the Debye temperature from EPR data is also suggested.
Źródło:
Acta Physica Polonica A; 1993, 84, 6; 1143-1149
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Lattice Relaxation and Superposition Model Calculation in Gd$\text{}^{3+}$-Doped LiErF$\text{}_{4}$ and LiDyF$\text{}_{4}$ Crystals
Autorzy:
Misiak, L.
Powiązania:
https://bibliotekanauki.pl/articles/1928268.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The X-band EPR measurements were performed on Gd$\text{}^{3+}$-doped LiErF$\text{}_{4}$ and LiDyF$\text{}_{4}$ single crystals at room temperature. The spin-lattice relaxation times were evaluated to be 2.7 × 10$\text{}^{-15}$ s, 1.0 × 10$\text{}^{-15}$ s and 2.2 × 10$\text{}^{-15}$ s for LiDyF$\text{}_{4}$ , LiErF$\text{}_{4}$ and LiYbF$\text{}_{4}$, respectively. Spin-Hamiltonian parameters are determined and discussed in the light of the superposition model in order to determine the distortion of Gd$\text{}^{3+}$ ion environment in LiREF$\text{}_{4}$ host lattices (RE = Yb, Y, Er, Dy, and Gd).
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 195-207
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR of Gd(Al$\text{}_{1-x}$M$\text{}_{x}$)$\text{}_{2}$; M = Ge, Sb Laves Phase Compounds
Autorzy:
Jarosz, J.
Powiązania:
https://bibliotekanauki.pl/articles/1964635.pdf
Data publikacji:
1997-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
ESR measurements for Gd(Al$\text{}_{1 -x}$Ge$\text{}_{x}$) and Gd(Al$\text{}_{1-x}$Sb$\text{}_{x}$) pseudobinary systems with x ≤ 0.15 are presented. In all investigated compounds a marked change in thermal broadening of the line width was observed in temperature lower than 300 K. Using obtained results the bottleneck parameter was calculated as a function of concentration x.
Źródło:
Acta Physica Polonica A; 1997, 92, 2; 339-341
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dynamic Orbit-Lattice Interactions for PbF$\text{}_{2}$:Gd$\text{}^{3+}$ Single Crystals
Autorzy:
Kuriata, J.
Rewaj, T.
Guskos, N.
Powiązania:
https://bibliotekanauki.pl/articles/1887420.pdf
Data publikacji:
1991-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
Temperature dependence of the second-order spin-lattice coefficients for PbF$\text{}_{2}$:Gd$\text{}^{3+}$ is reported. It is shown that the thermal expansion of the crystal lattice contributes only in about 14 % to the observed dependence and the rest should be ascribed to a dynamic coupling between the 4f$\text{}^{7}$ electrons and lattice vibrations. The results are parametrized in both the Einstein and the Debye models and it is shown that the phenomenological parameters obtained from such parametrization can be made to coincide in both models if a specific value of the Einstein frequency ω$\text{}_{E}$ is properly chosen. Both models of parametrization show that the Γ$\text{}_{3_{g}}$ vibrating mode couples to the 4f$\text{}^{7}$ electrons much weaker than the Γ$\text{}_{5_{g}}$ one.
Źródło:
Acta Physica Polonica A; 1991, 79, 4; 531-541
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR Study of Gadolinium(III) Complexes with Heteropolyanions: [Gd(SiW$\text{}_{11}$O$\text{}_{39}$)$\text{}_{2}$]$\text{}^{13-}$ and [GdP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$
Autorzy:
Szyczewski, A.
Lis, S.
Kruczyński, Z.
Pietrzak, J.
But, S.
Elbanowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1945634.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The gadolinium complexes: [Gd(SiW$\text{}_{11}$O$\text{}_{39}$)$\text{}_{2}$]$\text{}^{13-}$ [I] and [GdP$\text{}_{5}$W$\text{}_{30}$O$\text{}_{110}$]$\text{}^{12-}$ (Gd-encrypted Preyssler anion) [II] have been chosen for EPR study. This study is a continuation of our recent investigation related to solid gadolinium complexes: β-diketonates and aminopolycarboxylates. The EPR spectra of the Gd-polyoxometalates studied provide much better resolution than those recently studied. The spectra of Gd-polyoxometalates containing 1.7 to 2.5% of Gd(III) do not require an additional computer processing for correct interpretation. It is on the contrary to the β-diketonates and polyaminocarboxylates (with the content of Gd(III) 22-33%) for which the use of the RKU computer program (based on Fourier transform) was necessary in order to enhance the spectra resolution thus improving their correct interpretation. The EPR spectra obtained for the compounds I and II markedly differ from the U-spectrum characteristic of Gd(III) in glasses. Taking into account the spin-Hamiltonian calculations the existence of Gd(III) ion in two different surroundings: in a strong crystal field of rhombic symmetry and in a weak crystal field, is observed. The differences observed between the case I and II seem to be related to a various hydration degree.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 345-351
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
EPR of Gd$\text{}^{3+}$-Doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations
Autorzy:
Paradowski, M. L.
Misiak, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/1995695.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The X-band EPR study of Gd$\text{}^{3+}$-doped La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ single crystal in the temperature range 4.2-295 K is carried out in order to investigate crystal field effects, the Gd$\text{}^{3+}$ spin-phonon interactions, as well as Gd$\text{}^{3+}$ and Nd$\text{}^{3+}$ spin-lattice relaxation times. The local distortions at 4.2 K of the positions of the eight F$\text{}^{-}$ ions surrounding the Gd$\text{}^{3+}$ ion in the La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystal were determined from comparison of the theoretical with the experimental spin-Hamiltonian parameters. The spin-phonon interactions can be described by the Einstein model, which better characterizes the behavior of paramagnetic centers in LaF$\text{}_{3}$ and La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ crystals than the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 367-380
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Phonon Interactions for PbF$\text{}_{2}$:Gd$\text{}^{3+}$ - Comparison between Theory and Experiment
Autorzy:
Pastusiak, W.
Kuriata, J.
Powiązania:
https://bibliotekanauki.pl/articles/1920710.pdf
Data publikacji:
1992-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
The results implying from two microscopic models for spin-phonon interactions are analyzed for the case of PbF$\text{}_{2}$:Gd$\text{}^{3+}$ It is shown that the two-phonon first-order mechanism predicts significant contributions to the values of the spin-phonon second-order coupling constants and the one-phonon second-order mechanism is less effective.
Źródło:
Acta Physica Polonica A; 1992, 81, 4-5; 599-603
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Phonon Contributions to the b$\text{}_{2}^{0}$ Parameter for Gd$\text{}^{3+}$ in RbCdF$\text{}_{3}$ Single Crystals
Autorzy:
Guskos, N.
Kuriata, J.
Rewaj, T.
Powiązania:
https://bibliotekanauki.pl/articles/1920769.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
Opis:
Temperature dependence of the b$\text{}_{2}^{0}$ spin-hamiltonian parameter for Gd$\text{}^{3+}$ in RbCdF$\text{}_{3}$ single crystals is described. The dependence is interpreted in terms of the 4f$\text{}^{7}$ electrons coupling to the whole phonon spectrum of the crystal. The presented data give also an insight into the dynamics of charge compensators causing a tetragonal distortion of the crystal field.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 659-665
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Angular Dependences of ESR Parameters in Antiferroquadrupolar Phase of CeB₆
Autorzy:
Semeno, A.
Gilmanov, M.
Sluchanko, N.
Krasnorussky, V.
Shitsevalova, N.
Filipov, V.
Flachbart, K.
Demishev, S.
Powiązania:
https://bibliotekanauki.pl/articles/1032654.pdf
Data publikacji:
2017-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.-v
76.30.Kg
Opis:
Angular dependences of ESR line parameters (g-factor and linewidth Δ H) were experimentally explored in the antiferroquadrupolar phase of heavy fermion system CeB₆ at T=1.8 K. The data were obtained in two experimental geometries with different mutual directions of the wavevector k and the external magnetic field H at frequency of f=60 GHz. A g-factor anisotropy was found: while g-factors for [110] and [111] directions are close to each other (g ≈1.6), it is considerably higher (g ≈1.75) for [100]. The obtained angular dependence g(Θ) was compared with the theoretically predicted g-factor behavior for the Γp₈ state of Ce³⁺ ion in antiferroquadrupolar phase of CeB₆. It turns out that the experimental g-factor is considerably smaller at all angles than the theoretically calculated limits (2
Źródło:
Acta Physica Polonica A; 2017, 131, 4; 1060-1062
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
ESR of Gd$\text{}^{3+}$ Ions in Gd$\text{}_{0.9}$(Ce$\text{}_{z}$La$\text{}_{1-z}$)$\text{}_{0.1}$Cu$\text{}_{6}$ Compounds
Autorzy:
Kaczmarska, K.
Kwapulińska, E.
Powiązania:
https://bibliotekanauki.pl/articles/1929855.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
75.30.Et
Opis:
The effect of a replacing La by Ce in Gd$\text{}_{0.9}$La$\text{}_{0.1}$Cu$\text{}_{6}$ was investigated by ESR method. It was found that cerium ions cause an increase in the conduction electron relaxation to the lattice and change the conduction electron band structure.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 279-282
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gd$\text{}^{3+}$ Spin-Phonon Interactions in Rare-Earth Fluoride Crystals
Autorzy:
Paradowski, M. L.
Misiak, L. E.
Powiązania:
https://bibliotekanauki.pl/articles/2035540.pdf
Data publikacji:
2002-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Kr
76.30.Kg
Opis:
The X-band EPR study of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{ }$3, LiYF$\text{}_{4}$ and LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$ single crystals in the temperature range 4.2-295 K was carried out in order to investigate the Gd$\text{}^{3+}$ spin-phonon interactions. Spin-Hamiltonian parameters are analysed in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. The 4f$\text{}^{7}$ electron-phonon interactions can be described by the Debye model. It is suggested, from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters, that the rotational contributions are much smaller than those from the strain. Temperature-induced distortions of the crystal field, as well as these distortions caused by the La$\text{}^{3+}$/Nd$\text{}^{3+}$ and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions, influence significantly the 4f$\text{}^{7}$ electron-phonon interactions. The coupling constant K$\text{}_{2}$ of 4f$\text{}^{7}$ electrons to the whole phonon spectrum of the crystal lattice is stronger in the LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, La$\text{}_{0.9}$Nd$\text{}_{0.1}$F$\text{}_{3}$ with larger temperature-induced distortion of the Gd$\text{}^{3+}$ site symmetry than in LiYF$\text{}_{4}$, LiY$\text{}_{0.9}$Yb$\text{}_{0.1}$F$\text{}_{4}$. Our results are compared with those for Gd$\text{}^{3+}$-doped RbCdF$\text{}_{3}$ and PbF$\text{}_{2}$ single crystals.
Źródło:
Acta Physica Polonica A; 2002, 102, 3; 373-384
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Resonance and Dielectric Studies of a Nonlinear La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ Single Crystal Doped with Erbium
Autorzy:
Bodziony, T.
Typek, J.
Orlowski, M.
Majszczyk, J.
Wabia, M.
Berkowski, M.
Ryba-Romanowski, W.
Guskos, N.
Likodimos, V.
Anagnostakis, E. A.
Powiązania:
https://bibliotekanauki.pl/articles/2035732.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Kg
77.22.Ch
Opis:
Single crystal of erbium doped La$\text{}_{3}$Ga$\text{}_{5.5}$Ta$\text{}_{0.5}$O$\text{}_{14}$ grown by the Czochralski method have been investigated by electron paramagnetic resonance and dielectric spectroscopy methods. Dielectric permittivity ε measurements performed in 90-440 K temperature range have shown negligible dispersion for 1 kHz - 1 MHz frequencies and a Curie-Weiss type behaviour with C=47700 K andθ=-340 K. Electron paramagnetic resonance studies have revealed the presence of two different paramagnetic, monoclinic centres. The calculated g factor values are: g$\text{}_{1}$=1.449, g$\text{}_{2}$=11. 534, g$\text{}_{3}$=4.24 for the main M$\text{}_{1}$ centre and g$\text{}_{1}$=1.98, g$\text{}_{2}$=4.169, g$\text{}_{3}$=4.25 for the weaker M$\text{}_{2}$ centre. The temperature dependence of EPR line intensity for centre M$\text{}_{1}$ and M$\text{}_{2}$ is quite different - while lines attributed to M$\text{}_{1}$ could only be observed at low temperatures, below 20 K, lines of M$\text{}_{2}$ centre persisted up to 200 K. The M$\text{}_{1}$ centre is connected with Er$\text{}^{3+}$ ion entering substitutionally into La$\text{}^{3+}$ site, while M$\text{}_{2}$ is probably connected with 3d ions at the same site, unintentionally introduced into the material as an admixture.
Źródło:
Acta Physica Polonica A; 2003, 103, 2-3; 315-322
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
NMR Analysis of Mg Ion Localization in $LiNbO_{3}$ Crystal
Autorzy:
Yatsenko, A.
Yevdokimov, S.
Sugak, D.
Solskii, I.
Powiązania:
https://bibliotekanauki.pl/articles/1550498.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
76.30.Fc
76.30.Kg
77.84.Ek
Opis:
The analysis of cation sublattices population in magnesium doped $LiNbO_{3}$ crystals is carried out. It is shown that volume concentration of lithium vacancies $(V_{Li})$ monotonously increases with increasing of MgO content in the crystal up to the threshold value. A series of $LiNbO_{3}$ crystals with various concentration of $Mg^{2+}$ were investigated by $\text{}^{7}Li$ and $\text{}^{93}Nb$ Nuclear Magnetic Resonance (NMR). It is concluded that the peculiarities of NMR spectra in Mg-doped $LiNbO_{3}$ crystals can be explained by the formation of defect complexes including $Mg_{Li}$ ions and $V_{Li}$ on the shortest distances between them.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 166-169
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Luminescence of $Cu^{+}$ and $Cu^{2+}$ Ions in CsBr Crystals
Autorzy:
Zorenko, Y.
Voznyak, T.
Turchak, R.
Powiązania:
https://bibliotekanauki.pl/articles/1550555.pdf
Data publikacji:
2010-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Hh
76.30.Kg
76.30.Lh
76.70.Dx
Opis:
The luminescence of $Cu^{+}$ and $Cu^{2+}$ ions in CsBr:Cu and CsBr:$CuBr_{2}$ crystals, respectively, is investigated under excitation by synchrotron radiation in the CsBr fundamental absorption range at 10 K and 300 K. The existence of the luminescence bands of different origin: (i) the intrinsic radiative transition of $Cu^{+}$ ions in the bands peaked at 2.61 eV and 2.23 eV, (ii) the recombination luminescence of $Cu^{2+}$ ions in the bands peaked at 2.55 eV and 2.13 eV, (iii) the luminescence of excitons localized around $Cu^{+}$ and $Cu^{2+}$ ions in the band peaked at 3.08 eV and 3.38 eV, respectively, was found in CsBr:Cu and CsBr:$CuBr_{2}$ crystals. The energies of creation of exciton localized around $Cu^{+}$ and $Cu^{2+}$ ions (6.06 eV and 6.09 eV, respectively, at 10 K) and excitons bound with these ions (5.83 eV and 5.99 eV at 300 K) were determined as well.
Źródło:
Acta Physica Polonica A; 2010, 117, 1; 199-202
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rare-Earth Excitation Mechanism in Wide Band Gap H-VI Compounds
Autorzy:
Karpińska, K.
Świątek, K.
Godlewski, M.
Niinistö, L.
Leskelä, M.
Powiązania:
https://bibliotekanauki.pl/articles/1929798.pdf
Data publikacji:
1993-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.55.Gs
76.30.Kg
78.55.Et
Opis:
The excitation mechanism of rare-earth emission in Eu and Ce doped CaS and SrS is studied. It is proposed that the Eu and probably also Ce emission is induced by the photoionization transition of the rare-earth ion, which is followed by the carrier trapping via the excited state of the ion. At increased temperatures the efficiency of excitation is reduced. We explain this effect by the carrier emission from the excited core state of the rare-earth ion to the continuum of the conduction (valence) band states. It is also suggested that the charge transfer state of the rare-earth ion may act as the intermediate state in the carrier trapping.
Źródło:
Acta Physica Polonica A; 1993, 84, 5; 959-962
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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