Diffuse X-Ray scattering study of lead magnesium niobate single crystals

H. You, Q. M. Zhang

Research output: Contribution to journalArticlepeer-review

113 Scopus citations

Abstract

Single crystals of lead magnesium niobate, PbMg1/3Nb2/3O3, were studied with x-ray scattering measurements at temperatures between 10 and 350 K. The diffuse scattering around odd-integer Bragg reflections (H + K + L = odd) has a significant anisotropic component with ledges along (110) directions. We show that the transverse optic (ferro distortion) modes whose polarizations are along (110) directions are soft and responsible for the observed diffuse scattering. Upon cooling, these modes undergo a freezing process with q-dependent freezing temperatures. Below the lowest freezing temperature (T ≲ 190K) the diffuse scattering follows 1/q2 law, indicating an elastically distorted, static structure.

Original languageEnglish (US)
Pages (from-to)3950-3953
Number of pages4
JournalPhysical review letters
Volume79
Issue number20
DOIs
StatePublished - 1997

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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