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首页> 外文期刊>Physical review >Magnetic structure in the spin liquid Tb_2Ti_2O_7 induced by a [111] magnetic field: Search for a magnetization plateau
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Magnetic structure in the spin liquid Tb_2Ti_2O_7 induced by a [111] magnetic field: Search for a magnetization plateau

机译：[111]磁场在自旋液体Tb_2Ti_2O_7中的磁性结构：搜索磁化平稳期

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摘要

We have studied the field-induced magnetic structures of Tb_2Ti_2O_7 pyrochlore by single-crystal neutron diffraction under a field applied along the [111] axis, up to H = 12 T and down to T = 40 mK. We refined the magnetic structures with k = 0 propagation vector by performing a symmetry analysis in the space group R3m, reducing the number of free parameters to three only. The Tb moments gradually reorient towards the field direction, keeping close to a "3-in, 1-out / 1-in, 3-out" spin structure (magnetic space group R3m') in the whole measured field range 0.05-12 T. Our results rule out the "all-in/all-out" structure previously proposed and do not support the existence of a magnetization plateau. We perform a quantitative comparison with mean-field calculations and we propose the presence of a low-temperature dynamic symmetry breaking of the local trigonal symmetry, akin to a dynamic Jahn-Teller effect, i.e., preserving the overall cubic symmetry. We discuss the possible origin of this off-diagonal mixing term in the crystal field Hamiltonian in terms of quadrupole-quadrupole interaction or magnetoelastic effects.
机译：我们已经研究了在沿[111]轴施加的磁场下，沿H = 12 T且沿T = 40 mK方向施加的磁场，通过单晶中子衍射研究了Tb_2Ti_2O_7烧绿石的磁场结构。我们通过在空间组R3m中执行对称分析来精炼具有k = 0传播矢量的磁性结构，从而将自由参数的数量减少到三个。 Tb矩逐渐朝向磁场方向重新定向，在整个被测磁场范围内保持接近“ 3进1出/ 1进3出”自旋结构（磁空间群R3m'）。我们的结果排除了先前提出的“全进/全出”结构，并且不支持磁化平稳期的存在。我们用均值场计算进行定量比较，并提出了局部动态三角对称性的低温动态对称性破坏的存在，类似于动态Jahn-Teller效应，即保留了整体立方对称性。我们用四极-四极相互作用或磁弹性效应讨论了哈密顿晶体场中这种非对角混合项的可能起源。

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  • 来源
    《Physical review》 |2013年第18期|184428.1-184428.10|共10页
  • 作者

    A. P. Sazonov; A. Gukasov; H. B. Cao; P. Bonville; E. Ressouche; C. Decorse; I. Mirebeau;

  • 作者单位

    RWTH Aachen University, Institute of Crystallography, D-52056 Aachen, Germany,Forschungszentrum Juelich GmbH, Juelich Centre for Neutron Science at MLZ, D-85747 Garching, Germany,CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire Leon Brillouin, F-91191 Gif-sur-Yvette, France;

    CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire Leon Brillouin, F-91191 Gif-sur-Yvette, France;

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA,CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire Leon Brillouin, F-91191 Gif-sur-Yvette, France;

    CEA, Centre de Saclay, DSM/IRAMIS/Service de Physique de l'Etat Condense, F-91191 Gif-sur-Yvette, France;

    SPSMS, UMR-E CEA/UJF-Grenoble 1, INAC, F-38054 Grenoble, France;

    ICMMO UMR 8182, Universite Paris-Sud, F-91405 Orsay, France;

    CEA, Centre de Saclay, DSM/IRAMIS/Laboratoire Leon Brillouin, F-91191 Gif-sur-Yvette, France;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    strongly correlated electron systems; heavy fermions;

    机译：强相关电子系统;重费米子;

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