Phonons and Crystal Field Levels in Dysprosium Garnets by Raman Scattering

Wadsack, R. L.; Lewis, J.; Argyle, B. E.; Chang, Richard K.

doi:10.1103/physrevb.3.4342

Cited by 61 publications

(20 citation statements)

References 26 publications

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“…A comparison with previously published spectral measurements of Dy 3 Al 5 O 12 revealed that the frequency exactly matches the first of these crystal-field-split doublet states above the ground state. 22 This strongly points to the conclusion that the pump pulse causes the formation of a coherent superposition of ground and excited states, which leads to beating at a frequency corresponding to their energy difference.…”

Section: Discussionmentioning

confidence: 86%

“…Considering a dysprosium moment with local magnetic axis along the applied-field direction, a diagonalization of the crystal-field Hamiltonian, given by Wadsack et al, gives the spin-up ground state to be ͉g ↑ ͘ = 70%͉ 2 ͘ +¯. 22 The transfer between ͉g ↑ ͘ and ͉g ↓ ͘ is therefore not forbidden. However, calculation shows that the scattering rate for the ͉g ↑ ͘ → ͉f ↑ ͘ transfer is more than two orders of magnitude larger than the ͉g ↑ ͘ → ͉g ↓ ͘ transitions.…”

Section: (A) (B)mentioning

confidence: 99%

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Investigation of the femtosecond inverse Faraday effect using paramagneticDy3Al5O12

et al. 2010

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Pump-probe experiments on the rare-earth paramagnet Dy 3 Al 5 O 12 demonstrate that coupling between light and magnetism on the subpicosecond time scale cannot be adequately described by the thermodynamic model of the inverse Faraday effect but instead must be described microscopically by stimulated magneto-Raman scattering. Light-induced paramagnetic resonance, predicted by the thermodynamic theory, is not observed in Dy 3 Al 5 O 12 , however, the formation of a coherent superposition between other magnetic sublevels of the Dy 3+ -ion's ground-state multiplet is measured. It is shown that coherence can only be induced between magnetic levels which are connected by the Raman selection rules.

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Section: Discussionmentioning

confidence: 86%

Section: (A) (B)mentioning

confidence: 99%

Investigation of the femtosecond inverse Faraday effect using paramagneticDy3Al5O12

et al. 2010

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“…In addition, ferrimagnetic garnet materials have become important in microwave and data storage applications [4] and garnets with ordered or mixed structure have found applications in microelectronics and acoustoelectronics. Besides, the Dy 3 Al 5 O 12 and Er 3 Al 5 O 12 show cooperative phenomena at low temperatures [5].…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, Tarte [10] assigned the high frequency bands to modes of the tetrahedral units whereas Hurell et al [11] stated that these bands correspond to molecular modes, but they were not able to decide with certainty whether these are modes of the octahedral or of the tetrahedral units. A complete symmetry assignment of the phonon modes is not unambiguously done up to date although the IR and Raman spectra, for most of the members of the garnet family, have been already published in the literature [9][10][11][12][13][14]. To our opinion, this uncertainty occurs to a larger degree in the accidental degeneracies and/or in the low Raman scattering efficiencies of some modes with different symmetry (see later on in text) and to a lesser degree in the presence of electronic Raman scattering in these materials.…”

Section: Introductionmentioning

confidence: 99%

Lattice Dynamical Properties of the Rare Earth Aluminum Garnets (RE3Al5O12)

Papagelis

Kanellis

Ves

et al. 2002

phys. stat. sol. (b)

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PACS: 63.20.Dj; 78.30.Am; 87.64.Je This paper reports detailed lattice dynamics studies involving experimental Raman scattering measurements and theoretical rigid ion model calculations of the rare earth aluminum garnets (RE 3 Al 5 O 12 ). The studies are fairly involved as these garnets have complex crystal structure with 80 atoms/primitive cell. Our calculations have provided a theoretical understanding of the mode eigenvectors, phonon dispersion relations, density of states, and effective charges of these materials. The calculated Raman mode eigenvectors reveal that they correspond to mixtures of molecular modes of the basic polyhedra, implying thus strongly coupled polyhedra. The assignment of the Raman and infrared active modes has been elucidated and the frequencies of some modes, which do not appear in the vibrational spectrum, have been calculated. Our calculations show a differentiation of the effective charges at the various symmetry sites, which leads to a mostly covalent and to an almost ionic character for the tetrahedral Al-O and the dodecahedral RE-O bonds, respectively. Finally, the dispersion curves along the [100] direction of the Brillouin zone as well as the one and two-phonon density of states have been calculated and discussed.

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“…Each crystal field component in the split L S J manifolds of these ions belongs to one of the four representations of the group D,. Electronic Raman transitions between such levels have been observed (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13) in rare earth garnet crystals, and the intensity of each transition is related to the value of an element of a scattering matrix. From the form of this matrix the scattering tensor for transitions of the individual rare earth ions at their crystallographic sites can be determined.…”

Section: Magnetic Susceptibilities Of Terbiummentioning

confidence: 99%