Phys. Rev. B 72, 064113 (2005) [5 pages]Correlations between nanoscale chemical and polar order in relaxor ferroelectrics and the lengthscale for polar nanoregionsReceived 4 September 2004; revised 21 June 2005; published 22 August 2005 Molecular-dynamics simulations of a first-principles Hamiltonian for the model relaxor ferroelectric Pb(Sc1∕2Nb1∕2)O3 were used to determine the nature of correlations between chemical and polar short-range order. Relative to chemically disordered regions (CDRs), chemically ordered regions (CORs) exhibit enhanced polarization, and polarization fluctuations at all temperatures. Magnitudes of pairwise cluster-cluster polarization correlations follow the trend COR-COR, COR-CDR, CDR-CDR correlations. This result implies that the characteristic lengthscale for polar nanoregions is the same as for chemical short-range order. URL:
http://link.aps.org/doi/10.1103/PhysRevB.72.064113
DOI:
10.1103/PhysRevB.72.064113
PACS:
77.80.Bh, 07.05.Tp, 61.43.Bn, 82.35.Jk
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.