Abstract
Relaxor ferroelectrics such as PbMg1/3Nb2/3O3 (PMN), Sr0.75Ba0.25Nb2O6 (SBN75) and BaTi0.65Zr0.35O3 (BTZ35) are disordered ferroelectric solids, in which polar nanoregions (PNRs) are stabilized on cooling by random electric fields due to either charge or structural disorder prior to their cluster glass transitions at Tg. This two-step process is clearly distinct from conventional (atomic) spin glass transitions. Decisive features of the mesoscopic cluster glass ground states are critical glass dynamics at Tg and stretched exponential relaxation, memory and rejuvenation upon aging below Tg.
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