Spin-wave and electromagnon dispersions in multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>MnWO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>as observed by neutron spectroscopy: Isotropic Heisenberg exchange versus anisotropic Dzyaloshinskii-Moriya interaction

Xiao, Yinguo; Kumar, C. M. N.; Nandi, S.; Su, Yixi; Jin, Wentao; Fu, Zhendong; Faulhaber, E.; Schneidewind, A.; Brückel, Thomas

doi:10.1103/physrevb.93.214428

Cited by 8 publications

(17 citation statements)

References 55 publications

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“…The refined exchange parameters and the single-ion anisotropy K are listed in Table I. Our results are consistent with the independent INS work by Xiao et al [47], where the subtle difference is likely due to the uncertainty in extracting the dispersion relations from the experimental data.…”

Section: Spin Waves In the Collinear Af1 Phasesupporting

confidence: 88%

“…When the low-energy model is solved in the mean-field Hartree-Fock approximation without taking into account the relativistic spinorbit interaction (SOI), all the SE parameters J i s (up to J 12 ) obtained from the calculation are in good agreement with the experimentally-derived results reported here and in Ref. [47]. This underscores the long-range isotropic exchange interactions are necessary to stabilize the magnetic structure.…”

Section: Spin Waves In the Collinear Af1 Phasesupporting

confidence: 83%

“…The magnetic interaction constants have been normalized in units of meV. For comparison, the parameters in Ref 47. and 48 are given in JiS and KS with S = 5/2.…”

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confidence: 99%

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Comprehensive inelastic neutron scattering study of the multiferroic Mn1−xCoxWO4

et al. 2018

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Using high-resolution inelastic neutron scattering, we examine the spin dynamics of Mn1−xCoxWO4 in the collinear AF1, the ac-b spiral AF2, and the ac cycloidal AF5 phases. The spin wave excitations are well described by a Heisenberg model with competing long-range exchange interactions (Ji up to 12 th nearest-neighbors) and the single-ion anisotropy K induced by the spinorbit interaction. While the exchange constants are relatively unchanged, the dominant effect of doping is to change the single-ion anisotropy from easy axis (K > 0) in the collinear AF1 phase to easy plane (K < 0) in the two multiferroic phases.

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Section: Spin Waves In the Collinear Af1 Phasesupporting

confidence: 88%

Section: Spin Waves In the Collinear Af1 Phasesupporting

confidence: 83%

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Comprehensive inelastic neutron scattering study of the multiferroic Mn1−xCoxWO4

et al. 2018

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“…The same crossover in the relative intensities of the observed modes can be seen in both E i = 29 and E i = 59 meV datasets. The collinear AFM MnWO 4 was reported to demonstrate the same rapid drop in the INS intensity of the two low-energy magnetoelastic modes, which were observed only within the momentum of 0.05 r.l.u away from the magnetic zone center [49].…”

Section: B Low-energy Dispersionmentioning

confidence: 77%

Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge

et al. 2019

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We present the detailed inelastic neutron scattering measurements of the noncollinear antiferromagnet Mn3Ge. Time-of-flight and triple-axis spectroscopy experiments were conducted at the temperature of 6 K, well below the high magnetic ordering temperature of 370 K. The magnetic excitations have a 5-meV gap and display an anisotropic dispersive mode reaching 90 meV at the boundaries of the magnetic Brillouin zone. The spectrum at the zone center shows two additional excitations that demonstrate characteristics of both magnons and phonons. The ab initio latticedynamics calculations show that these can be associated with the magnon-polaron modes resulting from the hybridization of the spin fluctuations and the low-energy optical phonons. The observed magnetoelastic coupling agrees with the previously found negative thermal expansion in this compound and resembles the features reported in the spectroscopic studies of other antiferromagnets with the similar noncollinear spin structures. arXiv:1906.07640v1 [cond-mat.str-el]

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“…MnWO 4 has attracted a considerable attention as an example of the spin-spiral magnet, which was theoretically suggested to be multiferroic [46], where this multiferroic behavior was indeed observed experimentally [46][47][48], and studied in many details after that [49][50][51][52].…”

Section: Noncollinear Spin Order and Ferroelectric Polarization Inmentioning

confidence: 92%

Superexchange theory of electronic polarization driven by relativistic spin-orbit interaction at half filling

Solovyev

2017

Phys. Rev. B

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By applying Berry-phase theory for the effective half-filled Hubbard model, we derive an analytical expression for the electronic polarization driven by the relativistic spin-orbit (SO) coupling.The model itself is constructed in the Wannier basis, using the input from the first-principles electronic structure calculations in the local-density approximation, and then treated in the spirit of the superexchange theory. The obtained polarization has the following form:where ǫ ji is the direction of the bond ij , e i and e j are the directions of spins in this bond, and P ij is the pseudovector containing all the information about the crystallographic symmetry of the considered system. The expression describes the ferroelectric activity in various magnets with noncollinear but otherwise nonpolar magnetic structures, which would yield no polarization without SO interaction, including the magnetoelectric (ME) effect, caused by the ferromagnetic canting of spins in the external magnetic field, and spin-spiral multiferroics. The abilities of this theory are demonstrated for the the analysis of linear ME effect in Cr 2 O 3 and BiFeO 3 and properties multiferroic MnWO 4 and β-MnO 2 . In all considered examples, the theory perfectly describes the symmetry properties of the induced polarization. However, in some cases, the values of this polarization are underestimated, suggesting that other effects, besides the spin and electronic ones, can also play an important role. * SOLOVYEV.Igor@nims.go.jp

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Spin-wave and electromagnon dispersions in multiferroicMnWO4as observed by neutron spectroscopy: Isotropic Heisenberg exchange versus anisotropic Dzyaloshinskii-Moriya interaction

Cited by 8 publications

References 55 publications

Comprehensive inelastic neutron scattering study of the multiferroic Mn1−xCoxWO4

Comprehensive inelastic neutron scattering study of the multiferroic Mn1−xCoxWO4

Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge

Superexchange theory of electronic polarization driven by relativistic spin-orbit interaction at half filling

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