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Nonlinear emergent elasticity and structural transitions of a skyrmion crystal under uniaxial distortion

机译：单轴畸变下天蝎子晶体的非线性出射弹性和结构转变

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摘要

Emergent crystals are the periodic alignment of "emergent particles," i.e., localized collective behavior of atoms or their charges, spins, or orbits. The elasticity of these novel states of matter suffering mechanical loads can be strikingly softer than that of the underlying material, showing great strain-mediated tunability. However, the deformation and possible failure of emergent crystals under strong strain, vital for realizing related applications, are hitherto unclear. Here we theoretically study the nonlinear elasticity and structural transitions of a Skyrmion crystal (SkX) suffering uniaxial distortion. Under moderate tension, a SkX behaves like a ductile material, with an exotic negative crossover elastic stiffness and a negative emergent Poisson's ratio at appropriate conditions of magnetic field. Under strong strain, we observe at most six phase transitions, generating four novel emergent crystals that are thermodynamically metastable. We argue that this nondestructive polymorphism is a general feature for any emergent crystals exposed to mechanical loads.
机译：新兴晶体是“新兴粒子”的周期性排列，即原子或其电荷，自旋或轨道的局部集体行为。这些承受机械载荷的新颖物质状态的弹性可能比其下层材料的弹性显着软，显示出很大的应变介导的可调性。然而，到目前为止，对于实现相关应用至关重要的，在强应变下出现的晶体的变形和可能的破坏尚不清楚。在这里，我们从理论上研究遭受单轴变形的Skyrmion晶体（SkX）的非线性弹性和结构转变。在适度的张力下，SkX的行为类似于易延展的材料，在适当的磁场条件下具有奇异的负跨接弹性刚度和负新兴泊松比。在强应变下，我们观察到最多六个相变，生成了四个热力学亚稳态的新型出现晶体。我们认为，这种无损多态性是任何暴露于机械载荷下的晶体的普遍特征。

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  • 来源
    《Physical review》 |2019年第21期|214412.1-214412.10|共10页
  • 作者

    Hu Yangfan; Lan Xiaoming; Wang Biao;

  • 作者单位

    Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

    Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

    Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China;

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