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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - A new spinel selenide spin ice material
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APS -APS March Meeting 2017 - Event - A new spinel selenide spin ice material

机译：APS -APS 2017年3月会议-活动-新型尖晶石硒化物自旋冰材料

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Rare earth pyrochlores such as the rare earth stannates and titanates are well known for having a variety of exotic magnetic ground states. The variety stems from the unique combination of the highly frustrated lattice geometry of corner sharing tetrahedra that forms the pyrochlore lattice, and from how each rare earth ion behaves in the local crystal electric field. In this talk we extend the discussion to a new class of materials with rare earth spins on the pyrochlore sublattice of the spinel structure: MgRE$_2$Se$_4$ (RE = rare earth). Since the local crystal field is vastly different in the spinels, the materials have distinctly different ground states from the pyrochlores with the same rare earth. In this talk, we focus on the RE = Er case, and present data demonstrating spin ice behavior. Heat capacity data shows the expected $1/2ln(3/2)$ residual entropy. We show magnetic diffuse scattering from neutron powder diffraction, and with reverse Monte Carlo fits show it is consistent with expectations for a spin ice. Lastly, we present measurements of the crystal electric field levels via inelastic neutron spectroscopy, and subsequent Monte Carlo fits of that data which confirm the local Ising nature of the material.
机译：众所周知，稀土烧绿石（例如稀土锡酸盐和钛酸盐）具有各种奇异的磁性基态。这种变化源于形成焦绿石晶格的角共享四面体的高度受挫的晶格几何形状的独特组合，以及每种稀土离子在局部晶体电场中的行为。在本次演讲中，我们将讨论范围扩展到在尖晶石结构的烧绿石亚晶格上具有稀土自旋的新型材料：MgRE $ _2 $ Se $ _4 $（RE =稀土）。由于尖晶石的局部晶体场相差很大，因此这些材料的基态与具有相同稀土的烧绿石有明显不同的基态。在本次演讲中，我们将重点放在RE = Er的情况下，并提供展示自旋冰行为的数据。热容量数据显示预期的$ 1 / 2ln（3/2）$剩余熵。我们显示了中子粉末衍射产生的磁扩散散射，反向蒙特卡罗拟合表明它与自旋冰的期望一致。最后，我们介绍了通过非弹性中子光谱法对晶体电场水平的测量，以及随后对该数据进行的蒙特卡洛拟合，从而确定了材料的局部伊辛特性。

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