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首页> 外文期刊>Physical review >Noncollinear magnetic ordering in the Shastry-Sutherland Kondo lattice model: Insulating regime and the role of Dzyaloshinskii-Moriya interaction
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Noncollinear magnetic ordering in the Shastry-Sutherland Kondo lattice model: Insulating regime and the role of Dzyaloshinskii-Moriya interaction

机译：Shastry-Sutherland Kondo晶格模型中的非共线磁性排序：绝缘状态和Dzyaloshinskii-Moriya相互作用的作用

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摘要

We investigate the necessary conditions for the emergence of complex, noncoplanar magnetic configurations in a Kondo lattice model with classical local moments on the geometrically frustrated Shastry-Sutherland lattice and their evolution in an external magnetic field. We demonstrate that topologically nontrivial spin textures, including a new canted flux state, with nonzero scalar chirality arise dynamically from realistic short-range interactions. Our results establish that a finite Dzyaloshinskii-Moriya (DM) interaction is necessary for the emergence of these novel magnetic states when the system is at half filling, for which the ground state is insulating. We identify the minimal set of DM vectors that are necessary for the stabilization of chiral magnetic phases. The noncoplanarity of such structures can be tuned continually by applying an external magnetic field. This is the first part in a series of two papers; in the following paper the effects of frustration, thermal fluctuations, and magnetic field on the emergence of novel noncollinear states at metallic filling of itinerant electrons are discussed. Our results are crucial in understanding the magnetic and electronic properties of the rare-earth tetraboride family of frustrated magnets with separate spin and charge degrees of freedom.
机译：我们研究了在几何受挫的Shastry-Sutherland晶格上具有经典局部矩的Kondo晶格模型中出现复杂，非共面磁性构型的必要条件，以及它们在外部磁场中的演化。我们证明拓扑非平凡的自旋纹理，包括一个新的倾斜通量状态，具有非零的标量手性，是由现实的短程相互作用动态地产生的。我们的研究结果表明，当系统处于半填充状态且基态处于绝缘状态时，有限的Dzyaloshinskii-Moriya（DM）相互作用对于这些新型磁态的出现是必要的。我们确定了手性磁性相稳定所必需的DM向量的最小集合。这种结构的非共面性可以通过施加外部磁场来连续调整。这是两篇论文系列的第一部分。在接下来的论文中，讨论了挫折感，热波动和磁场对金属在流动电子中充满新的非共线态的影响。我们的结果对于理解具有独立的自旋和电荷自由度的稀土四硼化失磁磁体系列的磁性和电子性能至关重要。

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  • 来源
    《Physical review》 |2017年第22期|224401.1-224401.7|共7页
  • 作者

    Munir Shahzad; Pinaki Sengupta;

  • 作者单位

    School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore;

    School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore;

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