Ferroelectric ordering in the relaxor Pb(Mg1/3Nb2/3)O-3 as evidenced by low-temperature phonon anomalies

S Wakimoto*, C Stock, RJ Birgeneau, ZG Ye, W Chen, WJL Buyers, PM Gehring, G Shirane

*Corresponding author for this work

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Neutron scattering measurements of the lowest-energy TO phonons in the relaxor Pb(Mg1/3Nb2/3)O-3 (PMN) are reported for 10less than or equal toTless than or equal to750 K. The soft mode, which is overdamped by the polar nanoregions below the Burns temperature T-d=620 K, surprisingly recovers below 220 K. The square of the soft-mode energy ((h) over bar omega(0))(2) increases linearly with decreasing temperature and is consistent with the behavior of a ferroelectric soft mode. At 10 K, (h) over bar omega(0) reaches 11 meV, the same value observed in ferroelectric Pb(Zn1/3Nb2/3)O-3 at low T. An unusual broadening of the TA phonon starts at T-d and disappears at 220 K, coincident with the recovery of the TO mode. These dynamics suggest that a well-developed ferroelectric state is established below 220 K.

Original languageEnglish
Article number172105
Number of pages4
JournalPhysical review B: Condensed matter and materials physics
Issue number17
Publication statusPublished - 1 May 2002


  • PBMG1/3NB2/3O3

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