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Phys. Rev. B 70, 184105 (2004) [7 pages]

Cold neutron study on the diffuse scattering and phonon excitations in the relaxor Pb(Mg1∕3Nb2∕3)O3

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H. Hiraka*
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA and Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan

S.-H. Lee and P. M. Gehring
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA

Guangyong Xu and G. Shirane
Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA

Received 25 March 2004; published 9 November 2004

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∼600 K. This cross section, which is most likely caused by chemical short-range order, persists down to 100 K, 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).

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.70.184105
DOI:
10.1103/PhysRevB.70.184105
PACS:
77.84.Dy, 61.12.−q, 77.80.−e, 64.70.Kb

*Electronic address: hiraka@imr.tohoku.ac.jp

 
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