Spin-Lattice Relaxation and Superposition Model Calculation in Gd3+-Doped LiErF4and LiDyF4Crystals

The X-band EPR study of Gd 3+ -doped Lao .9 Ndo . 1 F3 single crystal in the temperature range 4.2-295 K is carried out in order to investigate crystal field effects, the Gd3 + spin-phonon interactions, as well as Gd 3 + and Nd3 + spin-lattice relaxation times. The local distortions at 4.2 K of the positions of the eight F -ions surrounding the Gd 3 + ion in the Lao.9Nd0.1 F3 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 LaF3 and Lao,9Ndo.1 F3 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.

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“…The full linewidth at half peak of a Gaussian distribution due to dipole-dipole and exchange interactions, is given by the expression [36,37 ]…”

Section: Rotational Invariance and The Phonon-induced Contributions Tmentioning

confidence: 99%

EPR of Gd³⁺-Doped La_0.9Nd_0.1F₃Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

Paradowski

Misiak

1999

Acta Phys. Pol. A

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Transferred hyperfine interaction and zero field splitting of the Gd3+ ion in KY3F10

Debaud-Minorel

Mortier

Buzaré

et al. 1995

Solid State Communications

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The local field distribution of in transition metal fluoride glasses investigated by electron paramagnetic resonance

Legein

Buzaré

Silly

et al. 1996

J. Phys.: Condens. Matter

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The EPR spectra of Gd 3+ in two transition metal fluoride glasses (PZG and PBI) have been extensively studied as functions of temperature, Gd 3+ concentration and microwave frequency (S, X, K and Q bands). The marked changes observed in the EPR spectra with temperature and concentration imply the existence of pairs of Gd 3+ ions. The spectra of isolated Gd 3+ ions were obtained at low temperature for samples with low Gd 3+ doping concentration. Isolated Gd 3+ ions are characterized by a fine-structure b 0 2 -parameter distribution within the range 0.02-0.15 cm −1 . The simulations of these spectra are computed with a Czjzek finestructure parameter distribution (this solution prohibits the existence of axial symmetry sites). It indicates a decrease of the number of geometrical constraints compared to those for Cr 3+ and Fe 3+ (octahedral coordination in a fluoride medium), in agreement with the higher Gd 3+ coordination numbers. Gd 3+ -ion sites are found to be more distorted in PZG than in PBI, suggesting that the glass network has an influence on the Gd 3+ polyhedron distortion amplitude.

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Spin-Lattice Relaxation and Superposition Model Calculation in Gd³⁺-Doped LiErF₄and LiDyF₄Crystals

Cited by 4 publications

References 27 publications

EPR of Gd³⁺-Doped La_0.9Nd_0.1F₃Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

EPR of Gd³⁺-Doped La_0.9Nd_0.1F₃Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

Transferred hyperfine interaction and zero field splitting of the Gd3+ ion in KY3F10

The local field distribution of in transition metal fluoride glasses investigated by electron paramagnetic resonance

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Spin-Lattice Relaxation and Superposition Model Calculation in Gd3+-Doped LiErF4and LiDyF4Crystals

Cited by 4 publications

References 27 publications

EPR of Gd3+-Doped La0.9Nd0.1F3Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

EPR of Gd3+-Doped La0.9Nd0.1F3Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

Transferred hyperfine interaction and zero field splitting of the Gd3+ ion in KY3F10

The local field distribution of in transition metal fluoride glasses investigated by electron paramagnetic resonance

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Product

Resources

About

Spin-Lattice Relaxation and Superposition Model Calculation in Gd³⁺-Doped LiErF₄and LiDyF₄Crystals

EPR of Gd³⁺-Doped La_0.9Nd_0.1F₃Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations

EPR of Gd³⁺-Doped La_0.9Nd_0.1F₃Crystal: Spin-Phonon Interactions and Spin-Lattice Relaxations