Emergence of low dimensional ferroelectricity in Pr0.67Ca0.33MnO3 nanocrystal arrays

Shukla, Vinay Kumar; Mukhopadhyay, Soumik

doi:10.1039/c6ra19632b

Cited by 7 publications

(3 citation statements)

References 37 publications

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“…However, for low band width systems near half doping, the debate is mainly centered around the following competing pictures of charge ordering [10]: 1) CE type charge and magnetic ordering, originally proposed by Goodenough [11]; 2) Zener polaron (ZP) ordering with antiferromagnetic interaction between strong ferromagnetically coupled dimers [12]; 3) Coexistence of both CE type and ZP type ordering [13] or between correlated and uncorrelated polarons [14]. The last two frameworks have the additional advantage of being able to explain away the emergence of ferroelectricity in charge-ordered manganites [13,[15][16][17].…”

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confidence: 99%

Antiferromagnetic rare region effect in Pr0.5Ca0.5MnO3

Shukla

Mukhopadhyay

2018

Phys. Rev. B

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confidence: 99%

Antiferromagnetic rare region effect in Pr0.5Ca0.5MnO3

Shukla

Mukhopadhyay

2018

Phys. Rev. B

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“…The admixture phase can break the inversion symmetry and leads to the development of a local ferroelectric moment. In fact, the direct experimental evidence of subtle macroscopic ferroelectric polarisation has recently been found in remnant electrical polarisation measurements in PCMO samples [28,29], while indirect evidence of a local ferroelectric moment was confirmed earlier in EFG measurement [22]. Therefore, the observed peak in '(x) near x~0.45 may have a trace of the local ferroelectric moment due to the presence of the admixture phase composed of CB-type-and ZP-type-ordered phases.…”

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confidence: 78%

Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr1−xCaxMnO3 as a Signature of Charge-Ordered Phase Modulation

Singh¹,

Mondal²

2022

Condensed Matter

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Low-temperature dielectric properties of charge/orbital-ordered manganite, Pr1−xCaxMnO3 for 0.40 ≤ x ≤ 0.50, was investigated systematically as a function of Ca content, x. The Ca content dependence of dielectric permittivity and dissipation factor exhibited distinct maxima near x~0.45. The overall dielectric response of charge-ordered Pr1−xCaxMnO3 was dominated by dielectric polarization induced by polaron hopping and exhibited thermally activated relaxation behaviour. The thermally activated dielectric relaxation behaviour over the investigated temperature range was further analysed with the help of two models: the small polaron hopping model and the Mott three-dimensional variable range hopping model. The estimated polaron transport parameters also displayed non-monotonic variation with x and exhibited a broad minima between x = 0.425 and 0.45. Considering the previous work reported so far, the charge order pattern of Pr1−xCaxMnO3 below x = 0.425 was most likely to be of Zener-polaron type, while near x = 0.50 was checker-board type and for in-between compositions; neither pure checker-board type nor pure Zener-polaron type can be considered a ground state. The observed results suggest that a modulation of the checkerboard-type charge/orbital ordering pattern in Pr1−xCaxMnO3 possibly takes place in the Ca content range of investigation, 0.40 ≤ x ≤ 0.50.

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“…The admixture phase can break the inversion symmetry and leads to development of local ferroelectric moment. In fact the direct experimental evidence of subtle macroscopic ferroelectric polarization have recently been found in remnant electrical polarization measurement in Pr1−xCaxMnO3 samples[37,38] while indirect evidence of local ferroelectric moment have confirmed earlier in EFG measurement [34]…”

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confidence: 84%

Anomalous Ca-Content Dependence of Dielectric Property of Charge Ordered Pr1-xCaxMnO3 as a Signature of Charge-Ordered Phase Modulation

Mondal¹,

Singh²

2022

Preprint

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Low temperature dielectric property of charge/orbital ordered manganite, Pr1-xCaxMnO3 for 0.40≤x≤0.50 is investigated systematically as a function of Ca-content, x. The Ca-content dependence of dielectric permittivity and dissipation factor exhibit distinct maxima around x=0.45. The overall dielectric response of charge ordered Pr1-xCaxMnO3 is dominated by polarization induced by polaron hopping and exhibits thermally activated relaxation behaviour. The dielectric relaxation behaviour over the investigated temperature range is analysed with the help of small polaron hopping model and as well as variable range hopping model. The estimated polaron parameters also display non-monotonic variation with x and exhibit broad minima between x=0.425-0.45. The observed results suggest that a modulation of checker board type charge ordering pattern in Pr1-xCaxMnO3 is possibly taking place in the Ca-content range of investigation 0.40≤x≤0.50.

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Emergence of low dimensional ferroelectricity in Pr_0.67Ca_0.33MnO₃ nanocrystal arrays

Abstract: We discuss the emergence of low dimensional ferroelectricity in self-organized Pr0.67Ca0.33MnO3 nanocrystalline arrays deposited on a Si substrate.

Cited by 7 publications

References 37 publications

Antiferromagnetic rare region effect in Pr0.5Ca0.5MnO3

Antiferromagnetic rare region effect in Pr0.5Ca0.5MnO3

Anomalous Ca Content Dependence of Dielectric Properties of Charge-Ordered Pr1−xCaxMnO3 as a Signature of Charge-Ordered Phase Modulation

Anomalous Ca-Content Dependence of Dielectric Property of Charge Ordered Pr1-xCaxMnO3 as a Signature of Charge-Ordered Phase Modulation

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