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Neutron scattering study of ferroelectric Sn_2P_2S_6 under pressure

机译：压力下铁电Sn_2P_2S_6的中子散射研究

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摘要

Ferroelectric phase transition in the semiconductor Sn_2P_2S_6 single crystal has been studied by means of neutron scattering in the pressure-temperature range adjacent to the anticipated tricritical Lifshitz point (p ≈ 0.18 GPa, T ≈ 296 K). The observations reveal a direct ferroelectric-paraelectric phase transition in the whole investigated pressure range (0.18-0.6 GPa). These results are in a clear disagreement with phase diagrams assumed in numerous earlier works, according to which a hypothetical intermediate incommensurate phase extends over several or even tens of degrees in the 0.5 GPa pressure range. Temperature dependence of the anisotropic quasielastic diffuse scattering suggests that polarization fluctuations present above T_c are strongly reduced in the ordered phase. Still, the temperature dependence of the (200) Bragg reflection intensity at p = 0.18 GPa can be remarkably well modeled assuming the order-parameter amplitude growth according to the power law with logarithmic corrections predicted for a uniaxial ferroelectric transition at the tricritical Lifshitz point.
机译：半导体Sn_2P_2S_6单晶中的铁电相变已通过在与预期的三临界Lifshitz点（p≈0.18 GPa，T≈296 K）相邻的压力-温度范围内的中子散射进行了研究。观察结果表明，在整个研究压力范围（0.18-0.6 GPa）中，铁电-顺电具有直接的相变。这些结果与许多早期工作中假定的相图明显不同，根据相图，假设的中间不相称相在0.5 GPa压力范围内延伸了几度甚至几十度。各向异性准弹性弥散散射的温度依赖性表明，在T_c以上存在的极化波动在有序相中大大降低。尽管如此，在p = 0.18 GPa时（200）布拉格反射强度的温度依赖性仍然可以很好地建模，假设根据幂律具有阶跃参数幅度增长，并预测了对三临界Lifshitz点的单轴铁电跃迁的对数校正。

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  • 来源
    《Physical review》 |2012年第22期|224106.1-224106.8|共8页
  • 作者

    P. Ondrejkovic; M. Kempa; Y. Vysochanskii; P. Saint-Gregoire; P. Bourges; K. Z. Rushchanskii; J. Hlinka;

  • 作者单位

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic;

    Institute for Solid State Physics and Chemistry, Uzhgorod University 88000, Uzhgorod, Ukraine;

    ICGM (UMR CNRS No 5253), C2M, 34095 Montpellier Cedex, France,Laboratory MIPA, Department of Sciences and Arts, University of Nimes, 30021 NIMES Cedex 01, France;

    Laboratoire Leon Brillouin, Bat 563 CEA Saclay, 91191 Gifsur Yvette Cedex, France;

    Peter Griinberg Institut, Forschungszentrum Mich GmbH, 52425 Juelich and JARA-FIT, Germany;

    Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 18221 Praha 8, Czech Republic;

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  • 正文语种 eng
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  • 关键词

    incommensurate crystals;

    机译：不相称的晶体;

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