Effect of paramagnetic percolation on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Gd</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>EPR linewidths in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LiYb</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">x</mml:mi></mml:

Misra, Sushil K.; Orhun, Ufuk

doi:10.1103/physrevb.41.2577

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…In a different context of a Gd 3+ -doped mixed LiYb x Y 1− x F 4 single crystal with varying ratios of diamagnetic and paramagnetic Yb 3+ centres in the host crystal, a comparable line broadening beyond detectability had been explained by the formation of an exchange percolation network through the crystal by the paramagnetic centres. 70…”

Section: Resultsmentioning

confidence: 99%

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

Daniel

Szczuka

Jakes

et al. 2023

Phys. Chem. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

Daniel

Szczuka

Jakes

et al. 2023

Phys. Chem. Chem. Phys.

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“…Misra et al [14][15][16] have studied the compounds PrxLal_xF3:Gd 3+ [14], LiYb~Yl_xF4:Gd 3+ [15], H%YI_xVO4:Er 3+ [16]. References 14 and 15 are devoted mainly to percolation of clusters, in ref.…”

Section: Introductionmentioning

confidence: 99%

EPR of Yb3+ ions in Ba1−xLaxF2+x mixed crystals

et al. 2005

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Electron paramagnetic resonance (EPR) spectra of impurity Yb 3 § ions (about 0.1 at.%) in mixed crystals BaF:(I -x) plus LaF3(x) have been investigated for different values of the concentration x at a frequency of about 9.5 GHz by both continuous-wave (CW) EPR and electron spin echo methods. A spectrum of trigonal symmetry with a complex hyperfine structure is observed in "pure" BaFz:Yb 3 § (x = 0). Upon admixture of small amounts of LaF3 (x = 0.001), additional EPR lines arise with intensities increasing with the increase of x up to 0.005. These lines are attributed to trigonal centers including two rare-earth ions and two compensating fluorine ions. A further increase of x results in a decrease of the total EPR spectrum intensity, andat x > 0.05 the CW resonance becomes practically unobservable. This may be due to the formation of rare-earth ion clusters with paramagnetic Yb 3. ions occurring in domains with a disordered structure of surroundings resulting in very broad EPR lines, which cannot be registered by CW EPR. Indeed, very broad (not less than 1 kG) EPR lines were observed by the electron spin echo method for concentrations x > 0.02.

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“…14 Theoretical studies on EPR linewidth behavior in mixed magnetically dilute rare-earth crystals have been reported recently by Misiak, Misra, and Mikolajczak, 15 and by Misiak, Misra, and Orhun 16 on LiYb x Y 1Ϫx F x single crystals, and by Misra and Orhun 17 on Pr x La 1Ϫx F 3 single crystals. Percolation-cluster model was applied by Misra and Orhun 18 to explain the behavior of Gd 3ϩ EPR linewidths in LiYb x Y 1Ϫx F 4 , according to which, a percolation cluster extends across the sample broadening the EPR lines sharply as a result of shortened spinlattice relaxation times when the concentration of the paramagnetic ions exceeds a certain critical value.…”

Section: Introductionmentioning

confidence: 99%

Effect of host paramagnetic ions on theGd3+EPR linewidth in diluted Van-Vleck paramagnetsTm
Misra
¹
,
Andronenko
²

1996
Phys. Rev. B
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Gd 3ϩ EPR linewidths in diluted Van-Vleck paramagnets Ho x Y 1Ϫx VO 4 (xϭ0.0, 0.02, 0. 05, 0.1, 0.15, 0.25, 0.3, 0.5, 0.9, 1.0) and Tm x Lu 1Ϫx PO 4 (xϭ0.0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0) were measured at X band ͑8.7-9.6 GHz͒ in the temperature range 4.2-300 K as functions of temperature and concentration (x) of the host paramagnetic ions, Ho 3ϩ and Tm 3ϩ , respectively. It was found that the dipole-dipole and exchange interactions significantly influenced the measured linewidths in Ho x Y 1Ϫx VO 4 and Tm x Lu 1Ϫx PO 4 samples for the concentrations xϾ0.1 and xϾ0.6, respectively. Further, in Ho x Y 1Ϫx VO 4 samples with xϾ0.3 the EPR lines disappeared at temperatures above 10 K due to the formation of percolation clusters by Ho 3ϩ ions; the disorder was deduced to have a negligible effect in these hosts. Interaction of the lattice with the electronic quadrupole moment of Ho 3ϩ ions created different structural sites of Gd 3ϩ in Ho x Y 1Ϫx VO 4 samples with xϾ0.1 depending on the number of Ho 3ϩ ions in the immediate neighborhood of a Gd 3ϩ ion, resulting in the observation of up to three different sets of Gd 3ϩ EPR spectra. As for Tm x Lu 1Ϫx PO 4 samples with 0.1ϽxϽ0.8, it was the disorder, rather than a percolation cluster, that dominated the Gd 3ϩ EPR linewidths due to the rather large difference in the ionic radii of Tm 3ϩ and Lu 3ϩ ions, as well as in the unit-cell parameters of TmPO 4 and LuPO 4 . The temperature variation of the linewidths were found to be in accordance with those of the average magnetic moments of Ho 3ϩ and Tm 3ϩ ions in Ho x Y 1Ϫx VO 4 and Tm x Lu 1x PO 4 , respectively. Gd 3ϩ spin-Hamiltonian parameters were estimated at different temperatures for the two families of hosts. EPR spectra of the Er 3ϩ ion, present as a chemical impurity, have also been observed in Ho x Y 1Ϫx VO 4 samples at liquid-helium temperatures.

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Effect of paramagnetic percolation onGd3+EPR linewidths inLiYbx

Cited by 9 publications

References 13 publications

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

EPR of Yb3+ ions in Ba1−xLaxF2+x mixed crystals

Effect of host paramagnetic ions on theGd3+EPR linewidth in diluted Van-Vleck paramagnetsTm
Misra
¹
,
Andronenko
²

1996
Phys. Rev. B
Self Cite
1
0
1
0
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Effect of paramagnetic percolation onGd3+EPR linewidths inLiYbx

Cited by 9 publications

References 13 publications

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

Laplace inverted pulsed EPR relaxation to study contact between active material and carbon black in Li–organic battery cathodes

EPR of Yb3+ ions in Ba1−xLaxF2+x mixed crystals

Effect of host paramagnetic ions on theGd3+EPR linewidth in diluted Van-Vleck paramagnetsTmMisra1, Andronenko2 1996Phys. Rev. BSelf Cite1010View full textAdd to dashboardCite

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Effect of host paramagnetic ions on theGd3+EPR linewidth in diluted Van-Vleck paramagnetsTm
Misra
¹
,
Andronenko
²

1996
Phys. Rev. B
Self Cite
1
0
1
0
View full text Add to dashboard Cite