Virginia TechRaevski, I. P.Prosandeev, S. A.Emelyanov, A. S.Raevskaya, S. I.Colla, Eugene V.Viehland, Dwight D.Kleemann, W.Vakhrushev, S. B.Dellis, J. L.El Marssi, M.Jastrabik, L.2014-02-112014-02-112005-11-16Raevski, IP ; Prosandeev, SA ; Emelyanov, AS ; et al., Nov 2005. "Bias-field effect on the temperature anomalies of dielectric permittivity in PbMg1/3Nb2/3O3-PbTiO3 single crystals," PHYSICAL REVIEW B 72(18): 184104. DOI: 10.1103/PhysRevB.72.1841041098-0121http://hdl.handle.net/10919/25358In contrast to ordinary ferroelectrics where the temperature T-m of the permittivity maximum monotonically increases with bias field E in (1-x)PbMg1/3Nb2/3O3-(x)PbTiO3 (0 <= x <= 0.35) 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 0.06 <= x <= 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.application/pdfen-USIn CopyrightLead magnesium niobatePhase transitionsElectric fieldsRelaxersFerroelectricsZirconate-titanatePolarized ramanStatesModelSusceptibilityPerovskitesPhysicsArticle - Refereedhttp://link.aps.org/doi/10.1103/PhysRevB.72.184104https://doi.org/10.1103/PhysRevB.72.184104