Raman study of spin–phonon coupling in ErMnO<sub>3</sub>

Vermette, Jonathan; Jandl, S.; Gospodinov, M.

doi:10.1088/0953-8984/20/42/425219

Cited by 46 publications

(43 citation statements)

References 32 publications

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“…We note that this identification is consistent with the modes reported in reference 16 from FIR spectroscopy, except for the weaker modes E 1 and E 8 [25]. Finally, around 125 cm −1 a larger phononic band is observed in agreement with Ab initio calculation [26] and Raman spectroscopy [27].…”

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confidence: 91%

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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confidence: 91%

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

et al. 2014

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“…Raman and infrared absorption investigations of the temperature dependent phonon spectrum of YMnO 3 and LuMnO 3 have found a kink at and an abnormal hardening in the magnetically ordered phase, indicating strong spinphonon coupling [163][164][165]. Similar phonon hardening was also found in compounds with rare earth magnetic moments, HoMnO 3 and ErMnO 3 [128,166]. 3 .…”

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confidence: 60%

“…On the other hand, there is also evidence for strong spin lattice interactions as, for example, shown in the phonon hardening below [166]. This could explain the anomalies of the dielectric constant at the various phase boundaries, similar to other rare earth manganites.…”

Section: Multiferroic Properties and Phase Diagrams Of Ermnomentioning

confidence: 76%

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Lorenz

2013

ISRN Condensed Matter Physics

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Hexagonal manganites belong to an exciting class of materials exhibiting strong interactions between a highly frustrated magnetic system, the ferroelectric polarization, and the lattice. The existence and mutual interaction of different magnetic ions (Mn and rare earth) results in complex magnetic phase diagrams and novel physical phenomena. A summary and discussion of the various properties, underlying physical mechanisms, the role of the rare earth ions, and the complex interactions in multiferroic hexagonal manganites, are presented in this paper.

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“…The in-plane bonding force constants would be closely related with the lattice constant a, and the inter-plane bonding force constants with the lattice constant c. Therefore, our results suggest that, in hexagonal RMnO 3 thin films, both the lattice constants a and c would show a systematic variation with R, and the lattice constant c would have a weaker R dependence. The phonon scattering in hexagonal RMnO 3 has been investigated for various R ions, R = Y, [25,26] R = Ho, [27] R = Er, [28] R = Yb, [29] and R = Lu. [30] Comparing the phonon peak positions in these reported studies, we noticed that almost all the observed phonons did not show any systematic variation with R, contrary to our experimental findings.…”

Section: Resultsmentioning

confidence: 99%

“…[17,19 -20] Hexagonal RMnO 3 have ferroelectric properties with a fairly large remnant polarization and quite high Curie temperature (T C ), typically above 590 K. Hexagonal RMnO 3 also exhibit antiferromagnetic behaviors, while their Néel temperature (T N ) is low, in the range of 70-120 K, probably due to geometrical frustration. [3] The phonon scattering in hexagonal RMnO 3 has been investigated for various R ions, R = Y, [25 -26] R = Ho, [27] R = Er, [28] R = Yb, [29] and R = Lu. [30] However, to our knowledge, there is no systematic study on the R dependence of the phonon scattering in hexagonal RMnO 3 .…”

Section: Introductionmentioning

confidence: 99%

Raman scattering studies of hexagonal rare‐earth RMnO₃ (R = Tb, Dy, Ho, Er) thin films

Hiền

Chen

et al. 2011

J Raman Spectroscopy

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We have studied the rare-earth (R) dependence of the phonon and magnon scattering in hexagonal RMnO 3 (R = Tb, Dy, Ho, Er) thin films using Raman scattering spectroscopy. We found, as the ionic radius of R decreases from Tb to Er, the phonons shift to higher energies. Our results indicate that both the lattice constants a and c of hexagonal RMnO 3 would decrease when the ionic radius of R decreases, and the lattice constant c would have a weaker R dependence. The magnons also shift to higher energies when the radius of the R ion decreases, and they show faster upshift than the phonons. In addition, the Néel temperature also shows a systematic increasing behavior when the radius of the R ion decreases. The dependence of the rare-earth R on the magnons and the Néel temperature can be explained by the rapid increase of the spin-exchange integral when the Mn-Mn distance decreases.

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Raman study of spin–phonon coupling in ErMnO₃

Cited by 46 publications

References 32 publications

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Raman scattering studies of hexagonal rare‐earth RMnO₃ (R = Tb, Dy, Ho, Er) thin films

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Raman study of spin–phonon coupling in ErMnO3

Cited by 46 publications

References 32 publications

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

Magneto- to Electroactive Transmutation of Spin Waves inErMnO3

Hexagonal Manganites—(RMnO3): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Raman scattering studies of hexagonal rare‐earth RMnO3 (R = Tb, Dy, Ho, Er) thin films

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Raman study of spin–phonon coupling in ErMnO₃

Hexagonal Manganites—(RMnO₃): Class (I) Multiferroics with Strong Coupling of Magnetism and Ferroelectricity

Raman scattering studies of hexagonal rare‐earth RMnO₃ (R = Tb, Dy, Ho, Er) thin films