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Spin-orbiton and quantum criticality in FeSc_2S_4

机译:FeSc_2S_4中的自旋轨道和量子临界

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摘要

In FeSc_2S_4 spin-orbital exchange competes with strong spin-orbit coupling, suppressing long-range spin and orbital order and, hence, this material represents one of the rare examples of a spin-orbital liquid ground state. Moreover, it is close to a quantum-critical point separating the ordered and disordered regimes. Using terahertz and far-infrared spectroscopy we study low-lying excitations in FeSc_2S_4 and provide clear evidence for a spin-orbiton, an excitation of strongly entangled spins and orbitals. It becomes particularly well pronounced upon cooling, when advancing deep into the quantum-critical regime. Moreover, indications of an underlying structureless excitation continuum are found, a possible signature of quantum criticality.
机译:在FeSc_2S_4中,自旋轨道交换与强自旋轨道耦合竞争,抑制了远距离自旋和轨道顺序,因此,该材料代表了自旋轨道液态基态的稀有例子之一。此外,它接近将有序和无序状态分开的量子临界点。使用太赫兹和远红外光谱,我们研究了FeSc_2S_4中的低地激发,并提供了自旋轨道的清晰证据,即强纠缠的自旋和轨道的激发。当深入到量子临界状态时,它在冷却时变得特别明显。此外,发现了潜在的无结构激发连续体的迹象,这可能是量子临界的标志。

著录项

  • 来源
    《Physical review》 |2015年第12期|125112.1-125112.6|共6页
  • 作者单位

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany,Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Republic of Moldova;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Physics Department, University of California, Santa Barbara, California 93106-4030, USA;

    Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106-4030, USA;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

    Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, 86135 Augsburg, Germany;

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

    spin-orbit coupling, zeeman and stark splitting, jahn-teller effect; other nonmetallic inorganics; dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.);

    机译:自旋轨道耦合;塞曼和斯塔克分裂;詹恩-泰勒效应;其他非金属无机物;动态特性(动态磁化率;自旋波;自旋扩散;动态缩放等);

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