Enhanced polarization fluctuation in KF-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>BaTiO</mml:mtext></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>single crystals

Tsukada, Shinya; Hiraki, Yuuta; Akishige, Y.; Kojima, Seiji

doi:10.1103/physrevb.80.012102

Cited by 48 publications

(34 citation statements)

References 28 publications

(38 reference statements)

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“…Lattice instability and mode coupling have been considered to play an important role in the phase transition of polar dielectrics [23]. The dynamic behavior of precursor polar clusters manifests themselves as quasielastic central peaks centered at zero frequency [4,[24][25]. Figure 4 shows the temperature variation of the quasi-elastic central peak measured in the frequency range of ±560 GHz, corresponding to the wavenumber of approximately ±18 cm -1 .…”

Section: Resultsmentioning

confidence: 99%

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Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Roleder

Majchrowski

et al. 2014

Journal of the Korean Physical Society

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The temperature dependence of the elastic properties of antiferroelectric PbHfO3 was investigated by Brillouin scattering. The two structural phase transitions of antiferroelectric-antiferroelectricparaelectric phases were clearly identified by discontinuous changes in the acoustic mode frequencies and the hypersonic damping. The substantial softening of the mode frequency along with the remarkable increase in the acoustic damping observed in the paraelectric phase indicated the formation of precursor noncentrosymmetric (polar) clusters and their coupling to the acoustic waves. This was corroborated by the observation of quasi-elastic central peaks, the intensity of which grew upon cooling toward the Curie point. The obtained relaxation time exhibited a slowing-down behavior, suggesting that the dynamics of precursor clusters becomes more sluggish on approaching the phase transition temperature. 2PACS numbers: 78.35.+c, 62.50.+p

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Section: Resultsmentioning

confidence: 99%

“…One method to estimate the relaxation time of the precursor polar clusters is to use the single relaxation time approximation, based on which the LA mode anomalies can be analyzed by using the following equation [21,25].…”

Section: Resultsmentioning

confidence: 99%

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Roleder

Majchrowski

et al. 2014

Journal of the Korean Physical Society

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“…We note that τ in KF-substituted BaTiO 3 , determined in the same way, obeys the critical slowing down, i.e., τ becomes larger and larger toward T C . [31][32][33] The differences in τ between PZN-xPT and KF-substituted BaTiO 3 should reflect the different growing processes of their PNRs, as discussed in Sec. III B.…”

Section: Polarization Relaxation Coupled With the La Phononmentioning

confidence: 99%

“…5,19,20,[31][32][33]39 From the macroscopic point of view, the difference between them is the appearance of inflexion points in ν B , , ε , and ε . For example, Fig.…”

Section: B Elastic Anomaly At T *mentioning

confidence: 99%

“…However, ferroelectric materials with disorder, e.g., relaxor ferroelectrics and barium titanate-(BaTiO 3 -) based ferroelectrics show the anomaly in a much wider temperature range. [17][18][19][20]22,[31][32][33] We attribute the anomaly to a piezoelectric coupling inside the noncentrosymmetric disordered regions. Because the local structure inside the PNRs is noncentrosymmetric, 3,12,13 even though the matrix around the PNR is centrosymmetric, the polarization fluctuation can couple linearly with the strain fluctuation.…”

Section: A Elastic Anomaly Above the Curie Temperaturementioning

confidence: 99%

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Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
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The precursor dynamics of ferroelectric phase transitions in relaxor-based ferroelectric (1 − x) Pb(Zn 1/3 Nb 2/3 )O 3 -xPbTiO 3 single crystals, with x = 0.07, 0.10, and 0.12, were investigated using inelastic light scattering from a longitudinal acoustic phonon. An acoustic anomaly in a broad temperature range, which is characteristic of relaxor ferroelectrics, was observed. We describe the anomalies in the paraelectric phase by assuming local piezoelectric coupling inside polar nanoregions, which are surrounded by a nonpolar matrix. On the basis of local piezoelectric coupling, a relaxation time τ and a dynamic characteristic length L of the order-parameter (polarization) fluctuations were determined to be in the order of 10 −13 s and 10 −9 m, respectively. The τ and L values increase sharply upon cooling from high temperatures but more gradually below the intermediate temperature T * (=493 − 510 K). This result implies that the local polarization fluctuations grow rapidly upon cooling down to above T * and the growth rate decreases below T * . The inflexion point of this growth process in the paraelectric phase is related to the characteristic properties of relaxor-based solid solutions.

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T* of Relaxor Ferroelectric (1 − x) Pb(Zn_1/3Nb_2/3)O₃‐xPbTiO₃ Single Crystals Revisited Using Brillouin Spectroscopy

Naqvi

Lee

et al. 2020

Physica Status Solidi (a)

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The relaxor characteristics of Pb[(Zn 1/3 Nb 2/3 ) 1-x Ti x ]O 3 (PZN-xPT) single crystals(with x=0 and x=0.08) are investigated by using temperature-dependent Brillouin scattering spectroscopy. The longitudinal acoustic(LA) mode shows typical relaxor behaviors for PZN while its mode frequency exhibits a discontinuous change at the phase transition temperature(T C ) for PZN-8%PT. The transverse acoustic(TA) mode, which is forbidden in an ideal cubic phase at the backscattering geometry, appears in both samples at a certain temperature above either the dielectric maximum temperature(T m ) or T C . This breakdown of the Brillouin selection rule in the cubic phase indicates that the non-cubic polar regions become appreciable at this temperature where the interaction between the acoustic waves and the polar nanoregions (PNRs) is strong enough to enable the appearance of the TA mode. The intermediate characteristic temperature T* is determined in terms of the minimum of the temperature derivative of the half width of the LA mode, and the values were nearly the same as those determined via the acoustic emission signal measurements. These comparisons reveal the universal feature of the local phase transformation from dynamic to quasistatic PNRs at T*, giving rise to the appearance of the TA mode.

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Enhanced polarization fluctuation in KF-substitutedBaTiO3single crystals

Cited by 48 publications

References 28 publications

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
Self Cite
25
2
25
0
View full text Add to dashboard Cite

T* of Relaxor Ferroelectric (1 − x) Pb(Zn_1/3Nb_2/3)O₃‐xPbTiO₃ Single Crystals Revisited Using Brillouin Spectroscopy

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Enhanced polarization fluctuation in KF-substitutedBaTiO3single crystals

Cited by 48 publications

References 28 publications

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Elastic anomalies associated with the antiferroelectric phase transitions of PbHfO3 single crystals

Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/Tsukada1, Hidaka2, Kojima3 et al. 2013Phys. Rev. BSelf Cite252250View full textAdd to dashboardCite

T* of Relaxor Ferroelectric (1 − x) Pb(Zn1/3Nb2/3)O3‐xPbTiO3 Single Crystals Revisited Using Brillouin Spectroscopy

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Development of nanoscale polarization fluctuations in relaxor-based (1-x)Pb(Zn1/3Nb2/
Tsukada
¹
,
Hidaka
²
,
Kojima
³

et al. 2013
Phys. Rev. B
Self Cite
25
2
25
0
View full text Add to dashboard Cite

T* of Relaxor Ferroelectric (1 − x) Pb(Zn_1/3Nb_2/3)O₃‐xPbTiO₃ Single Crystals Revisited Using Brillouin Spectroscopy