Magnetoelectric phase diagrams of multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>GdMn</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>5</mml:mn></mml:msub></mml:mrow></mml:math>

Bukhari, Syed Hamad; Kain, Th.; Schiebl, M.; Shuvaev, A.; Pimenov, A.; Kuzmenko, A. M.; Wang, Xueyun; Cheong, Sang‐Wook; Ahmad, Javed

doi:10.1103/physrevb.94.174446

Cited by 24 publications

(14 citation statements)

References 32 publications

(23 reference statements)

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“…At this juncture, we would like to state that our preliminary x-ray diffraction experiments at selected temperatures establish the absence of any crystal structure change across 25 K and therefore the anomalies discussed above are magnetic in origin. Incidentally, in the case of RMn2O5 family as well, similar correlation between TN and magnetodielectric coupling exists, with a maximum for the Dy compound [33,34].…”

Section: B Dielectric and Magnetodielectric Behaviormentioning

confidence: 67%

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

2017

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The Haldane spin-chain compound, Tb2BaNiO5, has been known to order antiferromagnetically below (TN=) 63 K. The present magnetic studies on the polycrystals bring out that there is another magnetic transition at a lower temperature (T2=) 25 K, with a pronounced magnetic-field induced metamagnetic and metaelectric behavior. Multiferroic features are found below T2 only, and not at TN. The most intriguing observation is that the observed change of dielectric constant (Δε) is intrinsic and largest (e.g., ~ 18% at 15 K) within this Haldane spin-chain family, R2BaNiO5. Taking into account the fact that this trend (that is, the largest value of Δε for Tb case within this family) correlates well with a similar trend in TN (with the values of TN being ~55, 58, 53 and 32 K for Gd, Dy, Ho and Er cases), we believe that the explanation usually offered for this TN behavior in rare-earth systems is applicable for this Δε behavior as well. That is, single-ion anisotropy following crystal-field splitting is responsible for the extraordinary magnetodielectric effect in this Tb case. To our knowledge, such an observation was not made in the past literature of multiferroics.

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Section: B Dielectric and Magnetodielectric Behaviormentioning

confidence: 67%

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

2017

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“…RMn2O5 oxides constitute a second example of multiferroic materials, whose magnetoelectric properties are governed by 3d-4f electron interactions. [12][13][14][15][16] In RMn2O5, the presence of loops of 5 manganese MnO5/MnO6 polyhedra sharing corners and edges (Mn 3+ -Mn 4+ -Mn 3+ -Mn 4+ -Mn 3+ ) gives rise to magnetic frustration. It is considered that the symmetric exchange-striction arising from this frustrated structure creates offcentering of Mn +3 -ion, R (4f) -Mn (3d) coupling plays an important role on this exchangeinteraction.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of magnetodielectric coupling in 6H-perovskites Ba3RRu2O9 for heavier rare-earth cations ( R=Ho<

Basu

Caignaert

Ghara³

et al. 2019

Phys. Rev. Materials

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The role of rare-earth (R) ions on the magnetodielectric (MD) coupling is always intriguing and markedly different for different systems. Although many reports are available concerning this aspect in frustrated 3dtransition metal oxides, no such reports exist on higher d (4d/5d)-orbital based systems due to the rare availability of highly insulating 4d/5d-systems. Here, we systematically investigated the magnetic, dielectric, ferroelectric and magnetodielectric behavior of the 6H-perovskites Ba3RRu2O9 for different R-ions, namely, R= Sm, Tb and Ho, which magnetically order at 12, 9.5 and 10.2 K respectively. For R=Tb and Ho, the temperature and magnetic-field dependent complex dielectric constant traces the magnetic features, which manifests MD coupling in this system. A weak magnetic-field (H) induced transition is observed for ~30 kOe, which is clearly captured in H-dependent dielectric measurements. No MD coupling is observed for Ba3SmRu2O9. The MD coupling is enhanced by a factor of 3 and 20 times for R=Tb and Ho, respectively, when compared to that of the Nd-counterpart. These results evidence the gradual enhancement of MD coupling with the introduction of heavier R-ions in this series, which is attributed to their larger moment values. Our investigation establishes dominating 4d(Ru)-4f(R) magnetic correlation in this series for the heavier R-members.

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“…Magnetodielectric anomalies around the magnetic phase transitions, both spontaneous and magnetic field-induced, were observed in several magnets, including Co4Nb2O9 [11], Mn0.95Co0.05WO4 [12], and SrNdFeO4 [13]. Thus, the magnetodielectric properties of these materials can be used to study magnetic phase diagrams [14].…”

Section: Introductionmentioning

confidence: 99%

Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals

Pankrats

Balaev

Nikitin

et al. 2019

Journal of Magnetism and Magnetic Materials

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Orthorhombic Pb2Fe2Ge2O9 antiferromagnetic single crystals have been synthesized by a modified pseudo-flux technique and their magnetic, thermodynamic, and magnetodielectric properties have been investigated. It has been found that, below the Neel temperature (45.2 K), iron moments are arranged in a canted antiferromagnetic structure with a weak ferromagnetic moment parallel to the a axis. According to the specific heat measurement data, the TN value remains invariable in applied magnetic fields of up to 5 T within the experimental accuracy. The magnetic entropy in the investigated crystals attains 2Rln(2S+1) right above TN, which is indicative of a purely magnetic nature of the transition. It has been shown that the weak ferromagnetic moment is induced by the interplay between the single-ion anisotropy and antisymmetric Dzyaloshinskii-Moriya exchange interaction, with the latter contribution being dominant. It has been established from the angular dependences of the magnetization in three orthorhombic planes that the symmetries of the magnetic and crystal structure are identical. The magnetodielectric properties of the Pb2Fe2Ge2O9 single crystals have been studied at different mutual orientations of the electric and magnetic fields. The most prominent anomalies have been observed in the vicinity of the spin-flop transition in a magnetic field applied along the c axis.

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Magnetoelectric phase diagrams of multiferroicGdMn2O5

Cited by 24 publications

References 32 publications

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Extraordinarily large intrinsic magnetodielectric coupling of the Tb member within the Haldane spin-chain family R2BaNiO5

Enhancement of magnetodielectric coupling in 6H-perovskites Ba3RRu2O9 for heavier rare-earth cations ( R=Ho<

Magnetic and thermodynamic properties and spin-flop-driven magnetodielectric response of the antiferromagnetic Pb2Fe2Ge2O9 single crystals

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