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The stability of the disordered glassy phase in the relaxors PbMg1/3Nb2/3O3and (PbMg1/3Nb2/3O3)0.88(PbTiO3)0.12, called PMN and PMN-PT, was investigatedby preparing partially polarized samples and allowing them to age at zero fieldin the temperature range for which the phase is history-dependent. The PMN-PTpolarization would spontaneously increase until long-range order formed, firstappearing as giant polarization noise. Thus the thermodynamically stable phasein PMN-PT appears to be ferroelectric. In contrast, a PMN sample lacking thesharp first-order field-driven transition found in some other samplesspontaneously depolarized, consistent with its glassy state beingthermodynamically stable. Detailed thermal depolarization results in PMN showtwo distinct broad peaks as well as a small fraction of material with adistribution of abrupt melting transitions.Comment: submitted to Phys. Rev. B. 9 text pages + 10 fig

physical review. b, condensed matter and materials physics

Stability of glassy and ferroelectric states in the relaxors<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Pb</mml:mi><mml:msub><mml:mi mathvariant="normal">Mg</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>∕</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">Nb</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>∕</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi mathvariant="normal">O</…

Stability of glassy and ferroelectric states in the relaxorsPbMg1∕3Nb2∕3O