Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganite<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>0.7</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ca</mml:mi><mml:mn>0.3</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>

Freitas, R. S.; Mitchell, J. F.; Schiffer, P.

doi:10.1103/physrevb.72.144429

Cited by 87 publications

(54 citation statements)

References 41 publications

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“…This is the socalled magnetodielectric ͑or magnetocapacitance͒ effect, which has been reported for a wide range of materials. 11,[15][16][17][18][19][20] The problem with this approach, however, is that magnetoelectric coupling is not the only way to produce magnetocapacitance: as shown in this letter, magnetoresistive artifacts can also give rise to an apparently large magnetodielectric effect. Thus, while multiferroicity may imply magnetocapacitance, the converse is not true.…”

mentioning

confidence: 96%

“…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%

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Magnetocapacitance without magnetoelectric coupling

Catalán¹

2006

Applied Physics Letters

860

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: 96%

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confidence: 99%

Magnetocapacitance without magnetoelectric coupling

Catalán¹

2006

Applied Physics Letters

860

513

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“…Recently, several works have been devoted for study of dielectric properties in correlated electron oxides and the close relation has been revealed between dielectric response and electrical transport properties [7][8][9][10][11][12][13][14][15] . Most of these dielectric measurements have been done for bulk materials.…”

mentioning

confidence: 99%

“…Moreover, except intrinsic dielectric response of correlated electron oxides, several reports raised the concern that the dielectric behaviour includes extrinsic interface effect [14][15][16][17] . To avoid this contact problem, inserting an insulator layer into the measurement circuit has been adopted, but it makes the whole system more complicate 8,16 . In this paper, a p-n junction configuration 18,19 has been designed for dielectric response measurement of complex oxide thin films.…”

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confidence: 99%

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

et al. 2012

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Electronic phase separation is one of the key features in correlated electron oxides. The coexistence and competition of multiple phases give rise to gigantic responses to tiny stimuli producing dramatic changes in magnetic, transport and other properties of these compounds. To probe the physical properties of each phase separately is crucial for a comprehensive understanding of phase separation phenomena and for designing their device functions. Here we unravel, using a unique p-n junction configuration, dynamic properties of multiple phases in manganite thin films. The multiple dielectric relaxations have been detected and their corresponding multiple phases have been identified, while the activation energies of dielectric responses from different phases were extracted separately. Their phase evolutions with changing both temperature and applied magnetic field have been demonstrated by dielectric response. These results provide a guideline for exploring the electronic phase separation phenomena in correlated electron oxides.

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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. We have investigated the dielectric properties of Pr 0.7 Ca 0.…”

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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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Magnetodielectric consequences of phase separation in the colossal magnetoresistance manganitePr0.7Ca0.3MnO3

Cited by 87 publications

References 41 publications

Magnetocapacitance without magnetoelectric coupling

Magnetocapacitance without magnetoelectric coupling

Dynamics of multiple phases in a colossal-magnetoresistive manganite as revealed by dielectric spectroscopy

Multiferroic nature of charge-ordered rare earth manganites

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