Glassy freezing in relaxor ferroelectric lead magnesium niobate

Levstik, A.; Kutnjak, Zdravko; Filipič, C.; Pirc, R.

doi:10.1103/physrevb.57.11204

Cited by 289 publications

(226 citation statements)

References 34 publications

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“…The Landau coefficient ␣ is assumed to depend on T in the manner which has been described by Potts-type model computations of PMN ͑Ref. 36͒ as well as by the SRBRF model and experiment: 24,27 it decreases linearly with decreasing temperature and saturates at low temperatures without crossing zero. Correspondingly, due to random fields and random bonds, the correlation length increases as temperature decreases and, then, saturates at low temperatures.…”

Section: ͑6͒mentioning

confidence: 99%

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

et al. 2005

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In contrast to ordinary ferroelectrics where the temperature T m of the permittivity maximum monotonically increases with bias field E in ͑1−x͒PbMg 1/3 Nb 2/3 O 3 -͑x͒PbTiO 3 ͑0 ഛ x ഛ 0.35͒ single crystals, T m was found to remain constant or to decrease with E up to a certain threshold field E t , above which T m starts increasing. The threshold field E t decreases with increasing x, tending toward zero at approximately x = 0.4. We explain this dependence in the framework of models which take into account quenched random fields and random bonds. For crystals with 0.06ഛ x ഛ 0.13, the E-T phase diagrams are constructed. In contrast to PMN, they exhibit an additional, nearly field-independent boundary, in the vicinity of the Vogel-Fulcher temperature. We believe this boundary to correspond to an additional phase transition and the appearing order parameter is likely to be nonpolar.

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Section: ͑6͒mentioning

confidence: 99%

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

et al. 2005

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“…1(a)] exhibits a peak reaching "colossal" [18] values up to 10 4 . Its left flanks shift with frequency, signifying a relaxational process, and the overall behavior resembles that of so-called relaxor ferroelectrics [26,27]. However, one should be aware that the wellknown non-intrinsic Maxwell-Wagner (MW) relaxations arising in heterogeneous samples, in special cases can also mimic relaxor-ferroelectric behavior [18,28,29].…”

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confidence: 99%

Conductivity Contrast and Tunneling Charge Transport in the Vortexlike Ferroelectric Domain Patterns of Multiferroic Hexagonal YMnO3

et al. 2017

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We deduce the intrinsic conductivity properties of the ferroelectric domain walls around the topologically protected domain vortex cores in multiferroic YMnO3. This is achieved by performing a careful equivalent-circuit analysis of dielectric spectra measured in single-crystalline samples with different vortex densities. The conductivity contrast between the bulk domains and the less conducting domain boundaries is revealed to reach up to a factor 500 at room temperature, depending on sample preparation. Tunneling of localized defect charge carriers is the dominant charge-transport process in the domain walls that are depleted of mobile charge carriers. This work demonstrates that via equivalent-circuit analysis, dielectric spectroscopy can provide valuable information on the intrinsic charge-transport properties of ferroelectric domain walls, which is of high relevance for the design of new domain-wall-based microelectronic devices.The hexagonal manganites RMnO3 (R = Sc, Y, In, and Dy-Lu) form a unique group of multiferroics where a geometrically-driven mechanism triggers improper ferroelectricity [1]. Additional interest in this material class arose from the reported occurrence of vortex-like ferroelectric domain patterns [2,3,4]. Around the vortex cores, forming the centers of "cloverleaf" patterns of six domains, the polarization changes sign six times. These cores, evolving at a high-temperature structural transition [5], represent stable topological defects. Even strong electric fields only lead to a variation of ferroelectric domain sizes in these materials, but are unable to completely eradicate unfavorable domains and to generate a mono-domain state [2,6]. Moreover, there is a strict coupling of ferroelectric and antiferromagnetic domain walls (DWs), the latter forming at much lower temperatures around 100 K [7].Recently it was shown that these complex domain properties also may be of relevance from an application point of view: Conductive atomic-force microscopy (c-AFM) on ErMnO3 [4] and HoMnO3 [8] revealed that the conductance of the ferroelectric DWs is either enhanced or suppressed compared to the domains, being determined by the polarization orientation of the adjacent domains. As the DWs can be easily tuned by external fields, this opens the possibility of domain-boundary engineering and applications in microelectronics using the nanoscale DWs instead of the domains themselves as active device elements [9,10,11,12,13]. The hexagonal manganites seem especially suited for this kind of functionality: Their DWs are robust and represent persistent interfaces as they are attached to the vortex cores, but within these constraints they can be moved by an external field thus enabling switching [4,12,13].In general, insulating domain walls, also observed in various other systems as SrMnO3 thin films [14] and (Ca,Sr)3Ti2O7 [15], have shifted into the focus of interest, due to their possible applications, e.g., as rewritable nanocapacitors. The conductivity contrast between these DWs and the domains should be...

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“…Canonical relaxors generally feature a freezing temperature associated with the divergence of their correlation length and thus relaxation time. 85,86,104,105 In lead-containing relaxors, coincides with , and were proposed to determine a considerable thermally stimulated decrease of the values. 85 Figure 5.42 displays the ´´ measured on cooling in a broad frequency range (from 1 Hz to 100 kHz).…”

Section: Temperature-and Frequency-dependent Dielectric Propertiesmentioning

confidence: 99%

“…The divergence of the PNRs correlation length leads to divergence of their relaxation time and to a frozen state at . 104,105 This state is characterized by distinct historydependent functional properties 55,86 , as a result of the multiple metastable states of canonical relaxors in their non-ergodic state. 100 Non-canonical relaxors feature an analogous high temperature paraelectric and ergodic state when compared to canonical relaxors, as displayed in Figure 2.10 (b).…”

Section: Equation 217mentioning

confidence: 99%

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

Acosta

2016

Springer Theses

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Glassy freezing in relaxor ferroelectric lead magnesium niobate

Cited by 289 publications

References 34 publications

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

Bias-field effect on the temperature anomalies of dielectric permittivity inPbMg1∕3Nb2∕3

Conductivity Contrast and Tunneling Charge Transport in the Vortexlike Ferroelectric Domain Patterns of Multiferroic Hexagonal YMnO3

Strain Mechanisms in Lead-Free Ferroelectrics for Actuators

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