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- W2151770742 abstract "We report neutron scattering measurements of the structural correlations associated with the apparent relaxor transition in ${mathrm{K}}_{1ensuremath{-}x}{mathrm{Li}}_{x}{mathrm{TaO}}_{3}$ for $x=0.02$ [KLT(0.02)]. This compound displays a broad and frequency-dependent peak in the dielectric permittivity, which is the accepted hallmark of all relaxors. However, no evidence of elastic diffuse scattering or any soft-mode anomaly is observed in KLT(0.02) [J. Wen et al., Phys. Rev. B 78, 144202 (2008)], a situation that diverges from that in other relaxors such as ${mathrm{PbMg}}_{1/3}{mathrm{Nb}}_{2/3}{mathrm{O}}_{3}$. We resolve this dichotomy by showing that the structural correlations associated with the transition in KLT(0.02) are purely dynamic at all temperatures, having a time scale on the order of $ensuremath{sim}$ THz. These fluctuations are overdamped, nonpropagating, and spatially uncorrelated. Identical measurements made on pure ${mathrm{KTaO}}_{3}$ show that they are absent (within experimental error) in the undoped parent material. They exhibit a temperature dependence that correlates well with the dielectric response, which suggests that they are associated with local ferroelectric regions induced by the ${mathrm{Li}}^{+}$ doping. The ferroelectric transition that is induced by the introduction of ${mathrm{Li}}^{+}$ cations is therefore characterized by quasistatic fluctuations, which represents a stark contrast to the soft-harmonic-mode-driven transition observed in conventional perovskite ferroelectrics such as ${mathrm{PbTiO}}_{3}$. The dynamic, glasslike structural correlations in KLT(0.02) are much faster than those measured in random-field-based lead-based relaxors, which exhibit a frequency scale of order $ensuremath{sim}$ GHz and are comparatively better correlated spatially. Our results support the view that static random fields give rise to the relaxor phenomena, and that the glasslike dynamics observed here characterize a nascent response." @default.
- W2151770742 created "2016-06-24" @default.
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- W2151770742 date "2014-12-24" @default.
- W2151770742 modified "2023-09-27" @default.
- W2151770742 title "Fluctuating defects in the incipient relaxor<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi mathvariant=normal>K</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Li</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi>TaO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mo>(</mml:mo><mml:mi>x</mml:mi><mml:mo>=</…" @default.
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