Cold neutron study on the diffuse scattering and phonon excitations in the relaxor Pb ( Mg1/3 Nb2/3 ) O3
Abstract
Cold neutron scattering experiments have been performed to explore the energy, temperature, and wave-vector dependence of the diffuse scattering and the transverse acoustic (TA) phonons in the relaxor Pb(Mg1/3Nb2/3)O3 . We have observed a weak diffuse scattering cross section above the Burns temperature Td∼600K . This cross section, which is most likely caused by chemical short-range order, persists down to 100K , and coexists with the much stronger diffuse scattering that is attributed to the polar nanoregions. A systematic study of the TA phonon around (1, 1, 0) has also been carried out. The phonon is well defined for small wave-vectors q , but broadens markedly around q=(0.1,-0.1,0) .
- Publication:
-
Physical Review B
- Pub Date:
- November 2004
- DOI:
- 10.1103/PhysRevB.70.184105
- arXiv:
- arXiv:cond-mat/0403544
- Bibcode:
- 2004PhRvB..70r4105H
- Keywords:
-
- 77.84.Dy;
- 61.12.-q;
- 77.80.-e;
- 64.70.Kb;
- Niobates titanates tantalates PZT ceramics etc.;
- Neutron diffraction and scattering;
- Ferroelectricity and antiferroelectricity;
- Solid-solid transitions;
- Condensed Matter - Materials Science
- E-Print:
- 7 pages, 8 figures, 3 tables