Coupling between magnon and ligand-field excitations in magnetoelectric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Tb</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mtext>Fe</mml:mtext></mml:mrow><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mtext>O</mml:mtext><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>garnet

Kang, Tae Sun; Standard, E. C.; Ahn, K. H.; Sirenko, A. A.; Carr, G. L.; Park, S.; Choi, Young Jai; Ramazanoglu, M.; Kiryukhin, V.; Cheong, S.-W.

doi:10.1103/physrevb.82.014414

Cited by 23 publications

(15 citation statements)

References 23 publications

(49 reference statements)

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“…31 In our recent study of the far-IR excitations in Tb-IG we observed a coupling between magnons and ligand field electronic excitations of Tb 3+ and suggested that the tuning of the dielectric constant by temperature and magnetic field can be connected to the appearance of the hybrid magneto-electric modes. 4 In contrast, in the present studies of Dy-IG we found a stronger connection between the static dielectric constant and the spectra of the optical phonons (see Section VI of this paper). Also, we recently reported an observation of hybridization between electric-and magnetic-dipole activity for the ligand-field excitations, which was only possible due to the combined analysis of the transmission, reflection, and RAE spectra of Dy-IG.…”

Section: Far-ir Excitations In Re-igcontrasting

confidence: 54%

“…2 Formation of the local electric polarization induced by the magnetic ordering was also observed in Tb-IG. 3 These reports were followed by far-IR spectroscopic studies of the coupling between magnons and ligand-field excitations in Tb-IG in the temperature range of ~ 70 K. 4 These results bring up a number of new questions about the interconnection between the crystal and magnetic structure with the far-IR optical excitations in the related R-IGs compounds, such as Dy-IGs.…”

Section: Introductionmentioning

confidence: 99%

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Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
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Far-infrared spectra of ferrimagnetic Dy 3 Fe 5 O 12 single crystals have been studied in the spectral range between 12 and 700 cm -1 and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry. In the temperature range below T C =16 K for the magnetic ordering of Dy 3+ spins, a number of ligand field (LF) and Kaplan-Kittel (KK) exchange resonance modes have been found. Temperature dependences of their frequencies allowed us to estimate the ratio between the Fe−Dy and Dy−Dy exchange constants.We found that variation of the oscillator strength of the KK modes correlates with the magnetic field induced changes of magnetic permeability. The low temperature peak in the static value of the dielectric function at T C =16 K may be related to the observed temperature-induced variation of the oscillator strength of the optical phonons.

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Section: Far-ir Excitations In Re-igcontrasting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
Self Cite
17
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5
0
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“…[70] and Supplemental Material [51]). Magnon excitations could provide decay channels analogous to electronic excitations [67], given constraints due to momentum and energy transfer.…”

Section: Pr 3+ Cefsmentioning

confidence: 99%

Crystal field excitations and magnons: Their roles in oxyselenides Pr2O2M2OSe2(

et al. 2017

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We present the results of neutron scattering experiments to study the crystal and magnetic structures of the Mottinsulating transition metal oxyselenides Pr 2 O 2 M 2 OSe 2 (M = Mn, Fe). The structural role of the non-Kramers Pr 3+ ion was investigated, and analysis of Pr 3+ crystal field excitations was performed. Long-range order of Pr 3+ moments in Pr 2 O 2 Fe 2 OSe 2 can be induced by an applied magnetic field.

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“…Then, by hybridization, a magnetoelectric CF excitation can transfer its electro-activity to a magnon. This mechanism was already proposed in HoMn 2 O 5 and Tb 3 Fe 5 O 12 from FIR measurements [30,31]. In order to test the validity of this scenario in ErMnO 3 , the Er 3+ (J=15/2) CF levels were calculated using a point charge model [32,33], taking into account the 7 O 2− closer neighbors of the two Er sites, with screening factors [34], fitted to recover the experimentally identified CF levels.…”

mentioning

confidence: 99%

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

et al. 2014

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The low energy dynamical properties of the multiferroic hexagonal perovskite ErMnO3 have been studied by inelastic neutron scattering as well as terahertz and far infrared spectroscopies on synchrotron source. From these complementary techniques, we have determined the magnon and crystal field spectra and identified a zone center magnon only excitable by the electric field of an electromagnetic wave. Using comparison with the isostructural YMnO3 compound and crystal field calculations, we propose that this dynamical magnetoelectric process is due to the hybridization of a magnon with an electro-active crystal field transition. The term magnetoelectric (ME) makes reference to a variety of phenomena in which electric dipoles and magnetic moments are mutually linked [1]. ME processes attract a considerable research interest, largely driven by their potential use in future information technologies [1, 2] and, more recently, by their interpretation in terms of exotic magnetic and ME monopoles [3]. A ME process that is particularly striking is the electric-charge dressing of spin-waves that gives rise to electrically active magnons (or electromagnons) [4].This dynamical ME effect has been most clearly demonstrated in multiferroic materials such as Several microscopic mechanisms have been identified behind the ME character of these hybrid excitations. In essence, they all trace back to the specific couplings between spins and the deformable lattice that can produce ferroelectricity. In orthorhombic RMnO 3 , for example, both the so-called inverse Dzyaloshinksii-Moriya and Heisenberg exchange mechanisms contribute to the static polarization [12] and also generate different electromagnons [5]. In hexagonal YMnO 3 , a phonon-magnon anticrossing has been observed revealing that lattice and spins are dynamically coupled in this system too [13,14]. However, the ME nature of this feature was not been proven and, to the best of our knowledge, no electromagnon has been reported so far in the other members of this family of prominent multiferroics [15][16][17]. In thisFIG. 1: Schematic illustration of ErMnO3 crystallographic and magnetic structure in the temperature range T N < T < TN where Mn magnetic moments are ordered at 120 • (a) and Er moments on the 4b site only are polarized in an antiferromagnetic arrangement (b). This multiferroic phase presents an electric polarisation P along the c-axis. The exchange interactions involved in the Mn magnetic order are also shown.Letter, we report on the presence of a new type of ME excitation in the hexagonal ErMnO 3 multiferroic compound. By means of complementary spectroscopic tools and the comparison with hexagonal YMnO 3 , we show evidence of the transmutation of a regular magnon to an electro-active excitation in ErMnO 3 . We ascribe this effect to a distinct hybridization mechanism between Mn 3+ spin-waves and crystal field (CF) excitations of the Er 3+ rare earth.In ErMnO 3 , the ferroelectric state occurs below T c = 833 K with a spontaneous polarization along the c-axis (pola...

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Coupling between magnon and ligand-field excitations in magnetoelectricTb3Fe5O12garnet

Abstract: The spectra of far-infrared transmission in

Cited by 23 publications

References 23 publications

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
Self Cite
17
1
5
0
View full text Add to dashboard Cite

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
Self Cite
17
1
5
0
View full text Add to dashboard Cite

Crystal field excitations and magnons: Their roles in oxyselenides Pr2O2M2OSe2(

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

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Coupling between magnon and ligand-field excitations in magnetoelectricTb3Fe5O12garnet

Abstract: The spectra of far-infrared transmission in

Cited by 23 publications

References 23 publications

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5OKang1, Standard2, Rogers3 et al. 2012Phys. Rev. BSelf Cite17150View full textAdd to dashboardCite

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5OKang1, Standard2, Rogers3 et al. 2012Phys. Rev. BSelf Cite17150View full textAdd to dashboardCite

Crystal field excitations and magnons: Their roles in oxyselenides Pr2O2M2OSe2(

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

Contact Info

Product

Resources

About

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
Self Cite
17
1
5
0
View full text Add to dashboard Cite

Far-infrared spectra of the magnetic exchange resonances and optical phonons and their connection to magnetic and dielectric properties of Dy3Fe5O
Kang
¹
,
Standard
²
,
Rogers
³

et al. 2012
Phys. Rev. B
Self Cite
17
1
5
0
View full text Add to dashboard Cite