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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
    Tytuł:
    Intermolecular Energy Transfer Between Lanthanide Complex Ions in Micellar Solution
    Autorzy:
    Dong, W.
    Flint, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929806.pdf
    Data publikacji:
    1993-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    34.20.-b
    76.30.Kg
    Opis:
    Two different procedures for the study of the quenching of excited states by lanthanide complex ions on the surface of micelles are considered. In the first, excited Tb(pdc)$\text{}_{3}^{3-}$ (pdc = pyridine 2,6-dicarboxylate) complex ions are held in close proximity to other Ln(pdc)$\text{}_{3}^{3-}$ ions on the surface of cetyl trimethyl ammonium micelles. Efficient energy transfer is observed by the electric dipole-electric dipole mechanism with a mean interaction distance only slightly greater than that which exists in the crystalline complexes. In the second, the excited state of Tb(pdc)$\text{}_{3}^{3-}$ is depopulated by energy transfer to the coexcited lowest excited triplet state of phenanthrene which is thereby excited to the second triplet state.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 5; 985-992
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stereoselectivity Effect on Tb(III)-Eu(III) Energy Transfer in Complexes with Glutamic Acid and Alanine
    Autorzy:
    Legendziewicz, J.
    Huskowska, E.
    Stręk, W.
    Łukowiak, E.
    Sztucki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1929811.pdf
    Data publikacji:
    1993-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.50.-j
    34.20.-b
    76.30.Kg
    Opis:
    The effect of stereoselectivity on energy transfer between Tb(III) and Eu(III) in crystals with glutamic acid and alanine was investigated. It was found that the stereoselectivity significantly changes the energy transfer in these systems. The theoretical model for the selective dependent energy transfer processes in lanthanide systems is developed and the nature of processes occurring in both systems under investigation briefly discussed.
    Źródło:
    Acta Physica Polonica A; 1993, 84, 5; 1021-1024
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recombination Processes for Deep Impurity States Degenerate with the Conduction Band
    Autorzy:
    Świątek, K.
    Godlewski, M.
    Kaliński, Z.
    Przybylińska, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1879955.pdf
    Data publikacji:
    1991-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.50.-w
    76.30.Kg
    78.55.Hx
    Opis:
    We report on the studies of autoionization efficiency and the relevant recombination mechanism for Eu$\text{}^{2+}$ in Ca$\text{}_{x}$Cd$\text{}_{1-x}$F$\text{}_{2}$ depending on the energy level position of Eu$\text{}^{2+}$ excited states in respect to the conduction band states.
    Źródło:
    Acta Physica Polonica A; 1991, 79, 2-3; 243-246
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slow Magnetic Relaxation in the Highly Anisotropic Layered Crystal CsNd(MoO₄)₂
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Tarasenko, R.
    Orendáč, M.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030440.pdf
    Data publikacji:
    2018-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Es
    76.30.Kg
    75.30.Gw
    75.40.Gb
    Opis:
    The present work is devoted to the magnetic relaxation study of the single crystal CsNd(MoO₄)₂ a layered rare-earth dimolybdate. AC susceptibility measurements performed in magnetic fields up to B=5 T applied along the easy and hard axis with frequency f ≈1 kHz revealed rather complex field-induced slow magnetic relaxation. Two relaxation regimes in different magnetic field intervals connected with magnetic interactions and possible single-ion relaxation mechanism were observed.
    Źródło:
    Acta Physica Polonica A; 2018, 133, 3; 466-469
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    SrS:Eu and CaS:Eu Thin Films: Influence of Host Lattice on Kinetics of Europium Emission
    Autorzy:
    Świątek, K.
    Godlewski, M.
    Niinistö, L.
    Leskelä, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1923720.pdf
    Data publikacji:
    1992-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Kg
    78.55.Et
    Opis:
    In this paper we report the studies of photoluminescent properties of CaS:Eu and SrS:Eu thin films containing up to 3 mole % of Eu, grown by the atomic layer epitaxy method. The energy transfer and direct intrashell excitation channels of Eu ions are examined in function of temperature.
    Źródło:
    Acta Physica Polonica A; 1992, 82, 5; 769-772
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recombination Processes in ZnSe:Eu
    Autorzy:
    Świątek, K.
    Godlewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1890962.pdf
    Data publikacji:
    1991-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Gs
    76.30.Kg
    78.50.Ge
    Opis:
    The photo-ESR and photoluminescence experiments have been performed on high-resistivity ZnSe:Eu crystals. We report the first evidence that the energy level of Eu$\text{}^{2+}$ ground state is located within the ZnSe forbidden gap, approximately 2.1 eV below the bottom of the conduction band.
    Źródło:
    Acta Physica Polonica A; 1991, 80, 3; 381-384
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic-Field Induced Slow Relaxation in the Ising-Like Quasi-One-Dimensional Ferromagnet KEr(MoO₄)₂
    Autorzy:
    Tkáč, V.
    Orendáčová, A.
    Dlháň, L'.
    Orendáč, M.
    Boča, R.
    Feher, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1030249.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    76.60.Es
    76.30.Kg
    75.30.Gw
    75.40.Gb
    Opis:
    We present the study of spin dynamics of KEr(MoO₄)₂ in the magnetic field applied along the hard axis c. The temperature dependence of AC susceptibility in zero magnetic field studied at frequencies f=10, 100, and 1000 Hz indicated the absence of relaxation in the temperature range from 2 to 20 K. Application of magnetic field induced a slow magnetic relaxation, which was investigated in detail in the field 0.5 T. The highest intensity of the relaxation process, reflected by the values of imaginary susceptibility was observed at 2 K. With increasing temperature, the relaxation process is weaker and vanishes completely above 3.5 K. Corresponding Cole-Cole diagrams were constructed and analyzed within a single relaxation process which can be associated with a direct relaxation process with a bottleneck effect, τ ≈1/T^b, and b=1.4. The slow relaxation at 2 K intensifies with increasing magnetic field at least up to 1 T.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 893-895
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gd$\text{}^{3+}$-RE$\text{}^{3+}$ Exchange Interactions in Rare-Earth Fluoride Crystals (RE = Ce, Nd, Yb)
    Autorzy:
    Paradowski, M. L.
    Misiak, L. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037294.pdf
    Data publikacji:
    2004-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    63.20.Kr
    75.30.Et
    75.30.Hx
    76.30.Kg
    Opis:
    The investigation of Gd$\text{}^{3+}$-doped LaF$\text{}_{3}$, La$\text{}_{0.9}$Ce$\text{}_{0.1}$F$\text{}_{3}$, CeF$\text{}_{3}$, 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 at 4.2 K was carried out in order to study the Gd$\text{}^{3+}$-RE$\text{}^{3+}$ exchange interactions (RE = Ce, Nd, Yb). The exchange interactions were estimated by the application of the molecular-field model at liquid-helium temperature, using the g shift from the isostructural diamagnetic hosts LaF$\text{}_{3}$ and LiYF$\text{}_{4}$ to the paramagnetic hosts. The lattice dynamics is studied by analysing spin-Hamiltonian parameters in the light of the superposition model and the rotational invariance theory for phonon-induced contributions to spin-Hamiltonian parameters. It is suggested from the rotational invariance mechanism for phonon-induced contributions to spin-Hamiltonian parameters that the rotational contributions influence the exchange interactions significantly. Further, the distortions caused by the La$\text{}^{3+}$/Ce$\text{}^{3+}$, La$\text{}^{3+}$/Nd$\text{}^{3+}$, and Y$\text{}^{3+}$/Yb$\text{}^{3+}$ substitutions affect significantly the 4f$\text{}^{7}$ electron-phonon interactions, as well as the exchange interactions. The magnitude of the isotropic exchange interactions is larger for more symmetrical charge distribution of the 4f$\text{}^{7}$ shell.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 5; 445-457
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of $La_3Ga_{5.5}Ta_{0.5}O_{14}$ Single Crystals Doped with Sm³⁺ and Er³⁺ Ions
    Autorzy:
    Kaczmarek, S.
    Leniec, G.
    Berkowski, M.
    Kazan, S.
    Acikgoz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1398323.pdf
    Data publikacji:
    2017-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.10.Dg
    76.30.Kg
    75.30.Gw
    75.40.Cx
    Opis:
    Electron paramagnetic resonance and magnetic susceptibility measurements were performed for two $La_3Ga_{5.5}Ta_{0.5}O_{14}$ single crystals doped with 1.96 at.% of Sm³⁺ ions and 3.8 at.% of Er³⁺ ions. Two magnetically inequivalent sites were found to be responsible for the electron paramagnetic resonance spectra of Sm³⁺ ions. Both sites reveal a low (at least C₂) symmetry with $g_{x}$~0.46, $g_{y}$~0.46 and $g_{z}$~0.52. The symmetry of isolated erbium ions is higher than C₂. From electron paramagnetic resonance and magnetic susceptibility experiments it results that the ground state of Er³⁺ ions is Γ⁶ or Γ⁷. Below 51 K electronic transitions within Γ⁶ doublets take place. Between 51 and 60 K, Γ⁶ to Γ⁷ transitions dominate, while above 60 K mainly transitions within Γ⁷ doublet are active.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 3; 366-369
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Various Impurities on the Optical Properties of YbF$\text{}_{3}$-Doped CaF$\text{}_{2}$ Crystals
    Autorzy:
    Stef, M.
    Pruna, A.
    Pecingina-Garjoaba, N.
    Nicoara, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047870.pdf
    Data publikacji:
    2007-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.25.Os
    76.30.Kg
    87.64.kv
    42.55.Rz
    Opis:
    Calcium fluoride crystals doped with YbF$\text{}_{3}$ and co-doped with LiF and NaF were grown using the vertical Bridgman method. Several of rare-earth ions (such as Eu, Sm, Ho, Tm, and Yb) can be stabilized in the divalent state in the CaF$\text{}_{2}$. The change of valence was attained by various methods. The optical absorption spectra reveal the characteristic absorption bands of the Yb$\text{}^{3+}$ and Yb$\text{}^{2+}$ ions. This means that the developed crystal growth process achieves a good Yb$\text{}^{3+}$ to Yb$\text{}^{2+}$ conversion in the as-grown crystals. The influence of other impurities, such as Na$\text{}^{+}$ or Li$\text{}^{+}$, on the absorption and emission spectrum of YbF$\text{}_{3}$-doped CaF$\text{}_{2}$ was studied. The Li$\text{}^{+}$ and Na$\text{}^{+}$ ions drastically decrease the absorption coefficient of the Yb$\text{}^{2+}$ ions in the UV band and the emission intensity by excitation in 230 nm.
    Źródło:
    Acta Physica Polonica A; 2007, 112, 5; 1007-1012
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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