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Direct evidence of soft mode behavior near the Burns' temperature in PbMg_(1 / 3)Nb_(2 / 3)O₃ (PMN) relaxor ferroectric

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arxiv cond-mat/0203103 v1 pith:WM237B22 submitted 2002-03-05 cond-mat.mtrl-sci

Direct evidence of soft mode behavior near the Burns' temperature in PbMg_(1 / 3)Nb_(2 / 3)O₃ (PMN) relaxor ferroectric

S. Vakhrushev (Ioffe Phys.-Tech. Institute , St. Peterburg , Russia) , S. Shapiro (BNL , Upton , NY , USA) This is my paper
classification cond-mat.mtrl-sci
keywords temperaturemodebehaviorburnsfrequencynearpbmgrelaxor
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Inelastic neutron scattering measurements of the relaxor ferroelectric PbMg$_{1 / 3}$Nb$_{2 / 3}$O$_{3}$ (PMN) in the temperature range 490~K$<$T$<$880~K directly observe the soft mode (SM) associated with the Curie-Weiss behavior of the dielectric constant $\varepsilon $(T). The results are treated within the framework of the coupled SM and transverse optic (TO1) mode and the temperature dependence of the SM frequency at q=0.075 a* is determined. The parameters of the SM are consistent with the earlier estimates and the frequency exhibits a minimum near the Burns temperature ($\approx $ 650K)

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