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Spin-orbit driven magnetic insulating state with J_(eff) = 1/2 character in a 4d oxide

机译:在4d氧化物中具有J_(eff)= 1/2特征的自旋轨道驱动磁绝缘状态

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摘要

The unusual magnetic and electronic ground states of 5d iridates have been shown to be driven by intrinsically enhanced spin-orbit coupling (SOC). The influence of appreciable but reduced SOC in creating the manifested magnetic insulating states in Ad oxides is less clear, with one hurdle being the existence of such compounds. Here, we present experimental and theoretical results on Sr_4RhO_6 that reveal SOC dominated behavior. Neutron measurements show the octahedra are both spatially separated and locally ideal, making the electronic ground state susceptible to alterations by SOC. Magnetic ordering is observed with a similar structure to an analogous y_(eff) = 1/2 Mott iridate. We consider the underlying role of SOC in this rhodate with density functional theory and x-ray absorption spectroscopy, and find a magnetic insulating ground state with J_(eff) = 1/2 character.
机译:研究表明,5d铱酸盐的异常磁性和电子基态是由固有增强的自旋轨道耦合(SOC)驱动的。在Ad氧化物中产生明显的磁绝缘态时,SOC的可观但降低的影响尚不清楚,其中一个障碍是此类化合物的存在。在这里,我们提出关于Sr_4RhO_6的实验和理论结果,揭示了SOC主导的行为。中子测量结果表明八面体在空间上是分离的,并且在局部上是理想的,这使得电子基态容易受到SOC的影响。观察到具有与类似的y_(eff)= 1/2 Mott iridate相似的结构的磁性排序。我们使用密度泛函理论和X射线吸收光谱法研究了SOC在该铑酸盐中的潜在作用,并找到了J_(eff)= 1/2特征的磁绝缘基态。

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  • 来源
    《Physical review》 |2015年第18期|180413.1-180413.5|共5页
  • 作者单位

    Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

    Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA;

    Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA;

    Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA,Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    manganites; transition metals and alloys;

    机译:锰矿;过渡金属和合金;

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