Origin of the colossal dielectric response of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Pr</mml:mi><mml:mn>0.6</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>0.4</mml:mn></mml:msub><mml:mi mathvariant="normal">Mn</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>

Biškup, N.; Andrés, A. de; Martinez, J.L.; Perca, Cristian

doi:10.1103/physrevb.72.024115

Cited by 125 publications

(73 citation statements)

References 28 publications

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“…If the dielectric is not a very good insulator, this can cause the electric field to be mostly dropped in the charge-depleted interfacial area rather than in the core of the material, yielding artificially high apparent dielectric constants. This effect has been documented in several oxide materials, including manganites, [20][21][22] and may happen not only at dielectricelectrode interfaces but also at grain boundaries in ceramics 23 and interslab interfaces in superlattices. 24 Whether the heterogeneous nature of the sample is accidental ͑interfacial or grain-boundary layers͒, or deliberate ͑superlattices͒, either case can be described by the MaxwellWagner ͑M-W͒ capacitor model.…”

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confidence: 99%

Magnetocapacitance without magnetoelectric coupling

Catalán¹

2006

Applied Physics Letters

870

513

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The existence of a magnetodielectric (magnetocapacitance) effect is often used as a test for multiferroic behavior in new material systems. However, strong magnetodielectric effects can also be achieved through a combination of magnetoresistance and the Maxwell-Wagner effect, unrelated to true magnetoelectric coupling. The fact that this resistive magnetocapacitance does not require multiferroic materials may be advantageous for practical applications. Conversely, however, it also implies that magnetocapacitance per se is not sufficient to establish that a material is multiferroic.

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confidence: 99%

Magnetocapacitance without magnetoelectric coupling

Catalán¹

2006

Applied Physics Letters

870

513

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“…It is worth noting that the magnitude of presented dielectric constants without magnetic field is comparable with the bulk bismuth titanate in single crystals and polycrystals [18]. Therefore it is reasonable to exclude the extrinsic contributions from the Schottky barriers at electrical contacts [19]. Experiments showed that there was a magnetic transition from antiferromagnetism (AFM) to weak ferromagnetism at 65K for bulk Bi 6 Fe 2 Ti 3 O 18 materials [8].…”

Section: Resultsmentioning

confidence: 99%

Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field

et al. 2006

J. Phys.: Condens. Matter

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Good quality and fine grain Bi 6 Fe 2 Ti 3 O 18 magnetic ferroelectric films with single-phase layered perovskite structure have been successfully prepared via metal organic decomposition (MOD) method. Results of low-temperature magnetocapacitance measurements reveal that an ultra-low magnetic field of 10 Oe can produce a nontrivial magnetodielectric (MD) response in zero-field-cooling condition, and the relative variation of dielectric constants in magnetic field is positive, i.e., [ε r (H)-ε r (0)]/ε r (0)=0.05, when T<55K, but negative with a maximum of [ε r (H)-ε r (0)]/ε r (0)=-0.14 when 55K

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“…There is a report in the literature for the occurrence of a dielectric anomaly in Pr 0.6 Ca 0.4 MnO 3 around the charge-ordering transition temperature [11]. Although magnetic fields are noted to affect the dielectric properties of the manganites [12], there has been no definitive study of the effect of magnetic fields on the dielectric properties to establish whether there is coupling between the electrical and magnetic order parameters.…”

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Multiferroic nature of charge-ordered rare earth manganites

Serrao¹,

Sundaresan²,

Rao³

2007

J. Phys.: Condens. Matter

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The present study of the charge-ordered manganites shows that many of the chargeordered rare earth manganites are multiferroics showing magnetocapacitance. They also show exhibit certain other features. Thus, the broad maximum in the dielectric constant around T CO or T N becomes more prominent in the presence of the magnetic field in certain cases. The magnitude and sign of the magnetocapacitance effect depends on the frequency of measurement. It is generally better to employ a relatively high frequency, well above 10k Hz to obtain reliable data.We have also studied the dielectric properties of a few other charge-ordered rare earth manganites, La 0.25 Nd 0.25 Ca 0.5 MnO 3 being one of them. This material exhibits a re-entrant 4 ferromagnetic transition at a temperature lower than the charge-ordered transition. The chargeordered transition is around 240 K and the ferromagnetic transition is at 150 K [15]. Interestingly, we find maxima in the dielectric constant at both T CO and T N , the one at T CO being is more prominent (figure 4).It is important to note some of the important characteristics of the charge-ordered manganites studied by us in order to fully understand their ferroic properties. The most important feature is that all these manganites exhibit electronic phase separation at low temperatures (T < T CO ) [10]. They exhibit a decrease in resistivity on application of large magnetic fields (>4 T) [16,17]. Application of electric fields also causes a significant decrease in the resistivity of the manganites [17,18]. On the application of electric fields, the manganites show magnetic response [19]. Such electric field-induced magnetization may also be taken as evidence for coupling between the electric and magnetic order parameters in the manganites. It is likely that grain boundaries between the different electronic phases have a role in determining the dielectric behaviour. The importance of grain boundaries in giving rise to high dielectric constants has indeed been recognized [20,21]. In spite of the complexity of their electronic structure, the present study shows that the charge-ordered rare earth manganites possess multiferroic and magnetoelectric properties. Clearly, charge-ordering provides a novel route to multiferroic properties specially in the case of the manganites. Acknowledgement:

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Origin of the colossal dielectric response ofPr0.6Ca0.4MnO3

Cited by 125 publications

References 28 publications

Magnetocapacitance without magnetoelectric coupling

Magnetocapacitance without magnetoelectric coupling

Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field

Multiferroic nature of charge-ordered rare earth manganites

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Origin of the colossal dielectric response ofPr0.6Ca0.4MnO3

Cited by 125 publications

References 28 publications

Magnetocapacitance without magnetoelectric coupling

Magnetocapacitance without magnetoelectric coupling

Magnetodielectric effect of Bi6Fe2Ti3O18film under an ultra-low magnetic field

Multiferroic nature of charge-ordered rare earth manganites

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Magnetodielectric effect of Bi₆Fe₂Ti₃O₁₈film under an ultra-low magnetic field