Structural Anomalies and Multiferroic Behavior in Magnetically Frustrated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">T</mml:mi><mml:mi mathvariant="normal">b</mml:mi><mml:mi mathvariant="normal">M</mml:mi><mml:mi mathvariant="normal">n</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:math>

Chapon, L. C.; Blake, Graeme R.; Gutmann, Matthias J.; Park, S.; Hur, N.; Radaelli, P. G.; Cheong, S. W.

doi:10.1103/physrevlett.93.177402

Cited by 335 publications

(412 citation statements)

References 16 publications

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“…4 Despite this apparent restriction, a rather large number of single-phase systems have been identified as magnetoelectric multiferroics. [5][6][7] A number of microscopic mechanisms have been proposed for the development of multiferroic order, including, a magnetic Jahn-Teller distortion 8 for TbMn 2 O 5 , 9 bond and site ordering having distinct centers of inversion symmetry, 10 a microscopic mechanism leading to a spincurrent interaction, 11 the Dzyloshinskii-Moriya interaction, 12 a general anisotropic exchange striction, 13 a spin-phonon interaction, 14 and a strain-induced ferroelectricity. 15 Phenomenologically, magnetically induced ferroelectric order developing in systems having multiple magnetic phases can be understood by considering a trilinear term in the magnetoelectric free energy, F ME , coupling the electric polarization with two distinct order parameters 1 and 2 which together break inversion symmetry so that F ME ϰ P 1 2 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

2010

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We have investigated the magnetoelectric and magnetodielectric response in FeVO 4 , which exhibits a change in magnetic structure coincident with ferroelectric ordering at T N2 ≈15 K. Using symmetry considerations, we construct a model for the possible magnetoelectric coupling in this system and present a discussion of the allowed spin structures in FeVO 4 . Based on this model, in which the spontaneous polarization is caused by a trilinear spin-phonon interaction, we experimentally explore the magnetoelectric coupling in FeVO 4 thin films through measurements of the electric field-induced shift of the multiferroic phase transition temperature, which exhibits an increase of 0.25 K in an applied field of 4 MV/m. The strong spin-charge coupling in FeVO 4 is also reflected in the significant magnetodielectric shift, which is present in the paramagnetic phase due to a quartic spin-phonon interaction and shows a marked enhancement with the onset of magnetic order which we attribute to the trilinear spin-phonon interaction. We observe a clear magnetic field-induced dielectric anomaly at lower temperatures, distinct from the sharp peak associated with the multiferroic transition, which we tentatively assign to a spin-reorientation crossover. We also present a magnetoelectric phase diagram for FeVO 4 . We have investigated the magnetoelectric and magnetodielectric response in FeVO 4 , which exhibits a change in magnetic structure coincident with ferroelectric ordering at T N2 Ϸ 15 K. Using symmetry considerations, we construct a model for the possible magnetoelectric coupling in this system and present a discussion of the allowed spin structures in FeVO 4 . Based on this model, in which the spontaneous polarization is caused by a trilinear spin-phonon interaction, we experimentally explore the magnetoelectric coupling in FeVO 4 thin films through measurements of the electric field-induced shift of the multiferroic phase transition temperature, which exhibits an increase of 0.25 K in an applied field of 4 MV/m. The strong spin-charge coupling in FeVO 4 is also reflected in the significant magnetodielectric shift, which is present in the paramagnetic phase due to a quartic spin-phonon interaction and shows a marked enhancement with the onset of magnetic order which we attribute to the trilinear spin-phonon interaction. We observe a clear magnetic field-induced dielectric anomaly at lower temperatures, distinct from the sharp peak associated with the multiferroic transition, which we tentatively assign to a spin-reorientation crossover. We also present a magnetoelectric phase diagram for FeVO 4 . Disciplines Physics | Quantum Physics

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Section: Introductionmentioning

confidence: 99%

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

2010

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“…17 Recently, a similar evidence of uncompensated spontaneous electric polarization was reported in RMn 2 O 5 series where Jahn-Teller distortion led to the displacement of Mn 3+ ions giving rise to the uncommon canted AFE state. [27][28][29] Here, we display another unique case of uncompensated spontaneous electric polarization in a dissimilar system apart from the involvement of Jahn-Teller effect. Rather, a strong magnetoelastic coupling without orbital degeneracy in LCCO holds the key for the observed unconventional electric ordering.…”

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confidence: 99%

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
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This work reports an experimental study on the temperature dependence of the structural parameters of LiCrO2 (LCO) and Li0.99Cu0.01CrO2 (LCCO) by using synchrotron x-ray diffraction technique. A significant magnetoelastic coupling is revealed by the anomalies observed in lattice parameters at the magnetic and electric phase transitions, apparent as step-like features in both Cr−O, Li−O bond lengths as well as O−Cr−O bond angles. Magnetic, dielectric, and electric polarization measurements reveal the antiferromagnetic and antiferroelectric (AFE) ordering at 119 and 61 K, respectively for LCCO. Interestingly, a fairly large uncompensated spontaneous electric polarization appears for LCCO in contrast to nearly compensated polarization value for LCO below the AFE ordering. This is correlated to the structurally driven enhancement (∼ 4 times) of the interlayer Cr−O−Li/Cu−O−Cr superexchange interaction for LCCO. We argue that strong magnetoelastic coupling holds the key for the observed uncompensated spontaneous electric polarization in LCCO. PACS numbers: 75.80.+q, Coupling between structural and magnetic functionalities in strongly correlated systems, the so called magnetoelastic coupling, is one of the foremost topics in the physics of materials that are fundamentally and technologically promising. 1 This phenomenon, a subset of the recent terminology of multiferroicity, 2-5 attracts renewed attention after the discovery of colossal magnetoresistance. 6 This coupling usually appears as a structural change at the magnetic transition or change in magnetic functionalities at the structural transition. In such a backdrop of versatile abundance of scientific studies, 2-5 the evidence of magnetoelasticity with isostructural transition is quite rare, while those inheriting large atomic displacement are even rarer. 7,8 In the following study we observe a fairly large oxygen displacement at an isostructural transition, giving rise to ∼ 0.02 A step-like increase in Cr−O bond length as obtained from the x-ray diffraction studies using high-flux synchrotron source in a two-dimensional (2D) triangular lattice antiferromagnet (AFM), Li 0.99 Cu 0.01 CrO 2 (LCCO). Most interestingly, this displacement enhances remarkably (∼ 10 times) due to minimal Cu doping in LiCrO 2 (LCO).The ordered rock salt structure with R3m space group of LCO attracts significant attention for the unique 2D triangular lattice structure. As evident in Fig. 1(a) the layers consisting of Cr−O−Li−O−Cr atoms are stacked along c-axis. Notably, the intralayer Cr ions form typical 2D triangular lattice as displayed in Fig. 1(b). The intralayer exchange interaction (J) dominates over weak interlayer interaction (J ′ ) mediated through the long Cr−O−Li−O−Cr superexchange path. 9 The dominant 2D intralayer interaction effectively leads to the AFM transition at T N ≈62 K. 10-14 The Cr atoms surrounded by oxygen octahedra displayed in Fig. 1(d) exist in Cr 3+ state with S = 3/2. The AFM ordering below T N , however, produces a ground state characterized by strong spin ...

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“…A delicate balance between these competing interactions is responsible for a cascade of magnetic phase transitions at various temperatures. It was speculated [14] that the electric polarization P , aligned along the b-axis, can be ascribed to the so-called magnetic Jahn-Teller (J-T) effect due to the antiferromagnetic (AFM) interactions dominating between the neighboring Mn 3+ and Mn 4+ ions within the a-b plane. In fact it was revealed experimentally that the onset of P always coincides with a commensurate (CM) magnetic ordering in multiferroics RMn 2 O 5 (R = Tb, Dy, Ho, etc.)…”

mentioning

confidence: 99%

An investigation on magnetism, spin–phonon coupling, and ferroelectricity in multiferroic GdMn2O5

Jiang

Liu

et al. 2009

Appl. Phys. A

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The magnetization, Raman spectroscopy, and ferroelectricity of multiferroic GdMn 2 O 5 as a function of temperature and magnetic field are investigated. The complicated magnetic transitions at low temperatures are featured with anomalous Raman mode shifts, dielectric response, and ferroelectricity generation, indicating the significant spinphonon coupling. It is argued that this coupling is possibly responsible for the electrical polarization generation associated with the incommensurate-commensurate transition.

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Structural Anomalies and Multiferroic Behavior in Magnetically FrustratedTbMn2O5

Cited by 335 publications

References 16 publications

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
View full text Add to dashboard Cite

An investigation on magnetism, spin–phonon coupling, and ferroelectricity in multiferroic GdMn2O5

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Structural Anomalies and Multiferroic Behavior in Magnetically FrustratedTbMn2O5

Cited by 335 publications

References 16 publications

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

Magnetic structure and magnetoelectric coupling in bulk and thin filmFeVO4

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrODey1, Karmakar2, Majumdar3 et al. 2013Phys. Rev. B194181View full textAdd to dashboardCite

An investigation on magnetism, spin–phonon coupling, and ferroelectricity in multiferroic GdMn2O5

Contact Info

Product

Resources

About

Strong magnetoelastic coupling and unconventional electric polarization in the triangular-lattice multiferroic Li0.99Cu0.01CrO
Dey
¹
,
Karmakar
²
,
Majumdar
³

et al. 2013
Phys. Rev. B
19
4
18
1
View full text Add to dashboard Cite