Calculation of the paramagnetic host spin-lattice relaxation time from impurity-ion EPR linewidth

Misra, Sushil K.; Orhun, Ufuk

doi:10.1103/physrevb.39.2856

Cited by 22 publications

(12 citation statements)

References 14 publications

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“…The Tl given by (19) contains the ABiip term which is derived for a simple cubic lattice. The spin-lattice relaxation time of the host is shown to be given by [309] where (AB2) is the second moment for a crystal containing two kinds of paramagnetic spins [309].…”

Section: Determination Of Spin-lattice Relaxation Time T Of Host Ionmentioning

confidence: 99%

Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

Jain

Lehmann

1990

Physica Status Solidi (b)

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Section: Determination Of Spin-lattice Relaxation Time T Of Host Ionmentioning

confidence: 99%

Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

Jain

Lehmann

1990

Physica Status Solidi (b)

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“…Further, in the previously-made estimates of 7 of host ions using the V 0 2 + ion as impurity an incorrect expression was used [7, 81, which is only applicable to the case, where there is present only one kind of paramagnetic spin in the system, thus neglecting the important dipolar and exchange interactions between the impurity and host ions. Misra and Orhun [8] derived the correct expression for z, valid for a typical EPR situation, where there are present two different kinds of magnetic spins in the system, e g , V 0 2 + and Fez+ in the V02+-doped Fe(NH,),(SO,), . 6 H 2 0 (FASH, hereafter) lattice.…”

Section: Introductionmentioning

confidence: 99%

“…. lattices [lo, 111; and (iv) to estimate the spin-lattice relaxation time of the host Fez+ ions in FASH from V 0 2 + EPR linewidths, using the correct expression [8].…”

Section: Introductionmentioning

confidence: 99%

EPR of a VO²⁺‐Doped Fe(NH₄)₂ (SO₄)₂ · 6H₂O Single Crystal. VO²Fe²⁺ Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe²⁺ Ions

Misra

Orhun

1990

Physica Status Solidi (b)

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X-band (-9.5 GHz) electron paramagnetic resonance (EPR) studies of the VOz+ ion are carried out on a single crystal of the Tutton salt Fe(NH,),(SO,), . 6 H 2 0 (FASH) at 295, 80, and 4.2 K. The data indicate two physically-equivalent V 0 2 + sites in the unit cell, each consisting of three magneticallyinequivalent V 0 2 + ions. The principal values and direction cosines of the principal axes of the g2 and A' tensors are evaluated, using a least-squares-fitting program. An impurity [VO(H,O),]' + complex model of the vanadyl ion is found to explain the data well. The V 4 + -0 2 -bond directions for the V 0 2 + ions are deduced. The VOZ+-Fe2+ exchange-interaction constant in FASH is estimated. The host-ion (Fez +) spin-lattice relaxation time is estimated from V 0 2 + EPR linewidth. On a mesure le RPE a bande-X sur un monocristal du sel Tutton, Fe(NH,),(SO,), . 6 H 2 0 (FASH), a 295, a 80, et a 4,2 K. Les donnees indiquent deux sites physiquement equivalents de V 0 2 + dans l'unite de cellule, chacun contient trois ions de VOz +, non-equivalents magnetiquement. Les valeurs principaux et les cosinus des directions des axes principaux des tenseurs g2 et A' ont ete evalues, en utilisant un programme d'adaptation aux moindres carres a l'ordinateur. Un modele d'impurete, decrit par le complexe [VO(Hz0,]2+, explique bien les donntes. On a deduit les liens V4+-02-pour les ions de VOz+. Le constant d'interaction d'echange V02+-Fe2+ a 6tC estime. Le temps de relaxation spin-reseau des ions h8tes (Fez +) a Cte estimt, en utilisant les largeurs RPE de l'ion d'impurete V 0 2 +.

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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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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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Calculation of the paramagnetic host spin-lattice relaxation time from impurity-ion EPR linewidth

Cited by 22 publications

References 14 publications

Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

EPR of a VO²⁺‐Doped Fe(NH₄)₂ (SO₄)₂ · 6H₂O Single Crystal. VO²Fe²⁺ Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe²⁺ Ions

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

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Calculation of the paramagnetic host spin-lattice relaxation time from impurity-ion EPR linewidth

Cited by 22 publications

References 14 publications

Electron Paramagnetic Resonance of Mn2+ in Orthorhombic and Higher Symmetry Crystals

Electron Paramagnetic Resonance of Mn2+ in Orthorhombic and Higher Symmetry Crystals

EPR of a VO2+‐Doped Fe(NH4)2 (SO4)2 · 6H2O Single Crystal. VO2Fe2+ Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe2+ Ions

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

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Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

Electron Paramagnetic Resonance of Mn²⁺ in Orthorhombic and Higher Symmetry Crystals

EPR of a VO²⁺‐Doped Fe(NH₄)₂ (SO₄)₂ · 6H₂O Single Crystal. VO²Fe²⁺ Exchange Interaction and Spin–Lattice Relaxation Time of Host Fe²⁺ Ions

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