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Tai, Renzhong; Namikawa, Kazumichi; Sawada, Akikatsu; Kishimoto, Maki; Tanaka, Momoko; Lu, Peixiang; Nagashima, Keisuke; Maruyama, Hiroshi; Ando, Masami

doi:10.1103/physrevlett.93.087601

Cited by 85 publications

(65 citation statements)

References 17 publications

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“…In a similar previous study acoustic phonon velocities have been measured [176] as a function of pressure and the anomalies seen there been interpreted as arising from anisotropic fields. Fluctuating polar clusters have also been detected by picosecond X-ray laser speckle technique [177] in the paraelectric phase. Not only BaTiO 3 exhibits these locally distorted regions well above T C , there are similar observations for PbTiO 3 [178], PbHfO 3 [179,180], CdTiO 3 [181], superlattices of SrTiO 3 /DyScO 3 [182] and SrTiO 3 [153,154] -all of them showing classical soft mode behavior.…”

Section: Crossover Between Displacive and Order / Disorder Dynamicsmentioning

confidence: 99%

The polarizability model for ferroelectricity in perovskite oxides

Bussmann‐Holder

2012

J. Phys.: Condens. Matter

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This article reviews the polarizability model and its applications to ferroelectric perovskite oxides. The motivation for the introduction of the model is discussed and nonlinear oxygen ion polarizability effects and their lattice dynamical implementation outlined. While a large part of this work is dedicated to results obtained within the self-consistent-phonon approximation (SPA), also nonlinear solutions of the model are handled which are of interest to the physics of relaxor ferroelectrics, domain wall motions, incommensurate phase transitions. The main emphasis is to compare the results of the model with experimental data and to predict novel phenomena.

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Section: Crossover Between Displacive and Order / Disorder Dynamicsmentioning

confidence: 99%

The polarizability model for ferroelectricity in perovskite oxides

Bussmann‐Holder

2012

J. Phys.: Condens. Matter

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“…4. Зародыши СЭ-фазы в параобласти наблюдаются в форме нанокластеров с размерами ∼ 1 мкм при расстоянии между класте-рами d ∼ 10 мкм [31]. Заметная электрическая поляризация P(T c ) кластера наблюдается в интервале температур ΔT ≅ 20 К. Однако для детальной интерпретации таких экспериментальных данных нужен более тщательный расчет электрических потенциалов; см.…”

Section: а и мицекunclassified

Covalent-Band Model of the Condensed Matter

Mitsek

2005

Usp. Fiz. Met.

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Кулоновское взаимодействие пары электронов r i соседних ионов R j в пред-ставлении сильной связи сводится либо к энергии ковалентной связи (Г), либо к интегралу перескока (t), которые вычисляются для двумерных сис-тем типа фуллеренов (ФУЛ) и нанотрубок углерода (НТУ). Теория полупро-водниковых (п/п) систем дает зависимость энергии связи Г(Т) от темпера-туры Т, обусловленную флуктуациями химических (ковалентных) связей (ФХС). Рассчитанные п/п-характеристики (ширина запрещенной полосы, электросопро-тивление (ЭС) и пр.) зависят от набора параметров Г и ФХС. Каталитические свойства ФУЛ и НТУ, аккумуляция водорода в них, работа выхода выража-ются через Г(Т). Точность расчетов обусловлена определенностью задания многоэлектронных операторных спиноров (МЭОС) в пространствах Фока. Атомная и магнитная диаграммы Fe создаются конкуренцией зонных и ко-валентных (в представлении МЭОС) 3d−t 2g -и e g -электронов. Кулонівська взаємодія пари електронів r i сусідніх йонів R j в представлен-ні сильного зв'язку зводиться або до енергії ковалентного зв'язку (Г), або ж до інтеґрала перескоку (t), які обчислюються для двовимірних систем типу фуллеренів (ФУЛ) і нанорурок вуглецю (НРВ). Теорія напівпровід-

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“…It is also noted that ¾ dipole remained even above the T c in BT. Zalar et al, 35) Stern et al 36) and Tai et al 37) demonstrated the existence of local tetragonal type cluster that is originated from biased Ti motion between off-center sites in the paraelectric phase in BT single crystal by the NMR observation and picosecond soft X-ray laser speckle technique. The existing dipole polarization above the T c observed in Fig.…”

Section: ¹1mentioning

confidence: 99%

Analysis on dipole polarization of BaTiO3-based ferroelectric ceramics by Raman spectroscopy

Teranishi

Horiuchi

Hoshina

et al. 2010

J. Ceram. Soc. Japan

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Analysis of asymmetric Raman line shape disclosed the variation of phonon correlation length in A 1 (3TO) mode, L A1(3TO) , with temperature in the ceramics of BaTiO 3 (BT), Ba 0.6 Sr 0.4 TiO 3 (BST-0.6) and BaZr 0.25 Ti 0.75 O 3 (BZT-0.25), namely normal ferroelectrics, ferroelectrics with diffuse phase transition (DPT ferroelectrics) and relaxor ferroelectrics, respectively. In BT, L A1(3TO) exhibited steep increase at the Curie temperature (T c ) on cooling. This is attributed to the formation of the ferroelectric domains at the T c . Both BST-0.6 and BZT-0.25 showed gradual increase in L A1(3TO) on cooling across the dielectric maximum temperature (T m ), indicating the continuous increase in the average size of the polar nanoregions (PNRs). Normal ferroelectrics can be distinguished from DPT and relaxor ferroelectrics in this point. L A1(3TO) of BZT-0.25 was longer than that of BST-0.6 near the T m . This suggests the size of PNRs in BZT-0.25 is larger than that in BST-0.6. Huge dipole polarization of BZT-0.25, giving rise to the strong relaxor behavior, could be originated from the contribution of the large PNRs near the T m . DPT ferroelectrics can be also differentiated from relaxor ferroelectrics in terms of the average size of PNRs.

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Picosecond View of Microscopic-Scale Polarization Clusters in ParaelectricBaTiO3

Cited by 85 publications

References 17 publications

The polarizability model for ferroelectricity in perovskite oxides

The polarizability model for ferroelectricity in perovskite oxides

Covalent-Band Model of the Condensed Matter

Analysis on dipole polarization of BaTiO3-based ferroelectric ceramics by Raman spectroscopy

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