Coupling of Frustrated Ising Spins to the Magnetic Cycloid in Multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>TbMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Prokhnenko, O.; Feyerherm, R.; Mostovoy, Maxim; Aliouane, N.; Dudzik, E.; Wolter, A. U. B.; Maljuk, A.; Argyriou, D. N.

doi:10.1103/physrevlett.99.177206

Cited by 75 publications

(67 citation statements)

References 23 publications

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“…The whole ordering scheme of Tb in multiferroic TbMnO 3 results from competing J Mn−Tb and J Tb−Tb exchange interactions verifying our theoretical model reported in Ref. 22 VI.…”

Section: Discussionsupporting

confidence: 87%

“…22 This intermediate coupling regime should be very sensitive to any variation of J Mn−R and, correspondingly, strong effects on the Tb-magnetic ordering are expected. 22 In this paper we report on combined neutron diffraction, x-ray resonant magnetic scattering, and single crystal magnetization and dielectric measurements on substituted TbMn 1−x Ga x O 3 (x = 0, 0.04, 0.1) compounds. Substitution of Mn 3+ ion by the closest isovalent but nonmagnetic Ga 3+ was chosen to provide minimal disturbance of the lattice and effectively vary the total J Mn−Mn and, consequently, J Mn−R , while keeping J R−R constant.…”

Section: Introductionmentioning

confidence: 99%

“…22 the ordering of the R-spins below T R N (often referred as individual) is strongly dependent on the relative strengths of exchange interactions between Mn-and R-ions, J Mn−R , and between rare earths themselves, J R−R . will not significantly affect the Rordering as found for R = Dy that orders on its own (τ Dy = 1 2 = τ Mn ) below 6 K. 15,16 On the other hand, strong J Mn−R will force the R-ordering to the same periodicity as Mn down to the lowest temperatures as in case of R = Ho (τ Ho = τ Mn ).…”

Section: Introductionmentioning

confidence: 99%

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Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

et al. 2010

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Ga for Mn substitution in multiferroic TbMnO3 has been performed in order to study the influence of Mn-magnetic ordering on the Tb-magnetic sublattice. Complete characterization of TbMn1−xGaxO3 (x = 0, 0.04, 0.1) samples, including magnetization, impedance spectroscopy, and x-ray resonant scattering and neutron diffraction on powder and single crystals has been carried out. We found that keeping the same crystal structure for all compositions, Ga for Mn substitution leads to the linear decrease of T Mn N and τ Mn , reflecting the reduction of the exchange interactions strength JMn−Mn and the change of the Mn-O-Mn bond angles. At the same time, a strong suppression of both the induced and the separate Tb-magnetic ordering has been observed. This behavior unambiguously prove that the exchange fields J Mn−Tb have a strong influence on the Tb-magnetic ordering in the full temperature range below T Mn N and actually stabilize the Tb-magnetic ground state.

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“…The whole ordering scheme of Tb in multiferroic TbMnO 3 results from competing J Mn−Tb and J Tb−Tb exchange interactions verifying our theoretical model reported in Ref. 22 VI.…”

Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

et al. 2010

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“…3(c), which reveals that the energy miminum occurs at around φ = 145 • . The large anisotropy energy is consistent with the Ising behavior of Tb moment [11]. The easy axes of the Tb 3+ ions presented in Fig.…”

supporting

confidence: 83%

Spin-Orbit Coupling and Ion Displacements in MultiferroicTbMnO3

et al. 2008

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The magnetic and ferroelectric (FE) properties of TbMnO3 were investigated on the basis of relativistic density functional theory (DFT) calculations. We show that, due to spin-orbit coupling, the spin-spiral plane of TbMnO3 can be either the bc-or ab-plane, but not the ac-plane. As for the mechanism of FE polarization, our work reveals that the "pure electronic" model by Katsura, Nagaosa and Balatsky is inadequate in predicting the absolute direction of FE polarization. Our work indicates that to determine the magnitude and the absolute direction of FE polarization in spin-spiral states, it is crucial to consider the displacements of the ions from their centrosymmetric positions.PACS numbers: 75.80.+q,75.30.Gw, Recent studies on magnetic ferroelectric (FE) materials have shown that electric polarization can be significantly modified by the application of a magnetic field [1,2,3,4,5,6,7]. Perovskite TbMnO 3 with a spinspiral magnetic order is a prototypical multiferroic compound with a gigantic magnetoelectric effect [2]. Currently, there are two important issues concerning the FE polarization of TbMnO 3 . One concerns the origin of FE polarization. Model Hamiltonians studies of spin-spiral multiferroic compounds have provided two different pictures. In the Katsura-Nagaosa-Balatsky (KNB) model [5], the hybridization of electronic states induced by spinorbit coupling (SOC) leads to a FE polarization of the charge density distribution even if the ions are not displaced from their centrosymmetric positions. In contrast, the model study by Sergienko and Dagotto [7] concluded that oxygen ion displacements from their centrosymmetric positions are essential for the FE polarization in multiferroic compounds [8]. When carried out with the ions kept at their centrosymmetric positions, density functional theory (DFT) calculations [9] for the spin-spiral states of LiCuVO 4 predict FE polarizations that agree reasonably well in magnitude with experiment [10], which is in apparent support of the KNB model [5]. It is, therefore, important to check which model, the KNB or the "ion displacement" model, is relevant for the FE polarization in TbMnO 3 . The other issue concerns the spin-spiral plane of TbMnO 3 . Under a magnetic field, the spin-spiral plane of TbMnO 3 can be either the bc-plane or the abplane, but not the ac-plane. To explain this observation, it is necessary to probe the magnetic anisotropy of the Mn 3+ ion. The magnetic anisotropy of the Tb 3+ ion might be also relevant for the magnetoelectric effect, as suggested by Prokhnenko et al. [11].In this Letter, we investigated these issues on the basis of DFT calculations and found that the consideration of the ion displacements is essential for the FE polarizations in the spin-spiral state of TbMnO 3 , and the KNB model can be erroneous even for predicting the absolute direction of FE polarization. The absence of the ac-plane spin-spiral in TbMnO 3 is explained by the magnetic anisotropy of the Mn 3+ ion.Our calculations were based on DFT plus the on-site repulsion U m...

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“…We should highlight the importance of this result as it definitely confirms assumptions forwarded in previously published works carried out in orthorhombically distorted rareearth maganites. [17][18][19][20][21][22][23][24][25][26] What makes them a very interesting set of materials is the fact that they share a common GdFeO 3 -distortion, where the tilt angle of the MnO 6 octahedra becomes larger when the rare-earth radius decreases. This behaviour is illustrated in Figure 6 for several undoped rare-earth manganites and the Eu 1-x Y x MnO 3 doped system.…”

Section: General Considerations About the Phase Diagram Of Eumentioning

confidence: 99%

Coupling Between Spins and Phonons Towards Ferroelectricity in Magnetoelectric Systems

Moreira¹,

Almeida²

2011

Ferroelectrics - Physical Effects

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Coupling of Frustrated Ising Spins to the Magnetic Cycloid in MultiferroicTbMnO3

Cited by 75 publications

References 23 publications

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

Ga substitution as an effective variation of Mn-Tb coupling in multiferroicTbMnO3

Spin-Orbit Coupling and Ion Displacements in MultiferroicTbMnO3

Coupling Between Spins and Phonons Towards Ferroelectricity in Magnetoelectric Systems

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