Laser-Enhanced Single Crystal Growth of Non-Symmorphic Materials: Applications to an Eight-Fold Fermion Candidate,Chemistry of Materials

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Laser-Enhanced Single Crystal Growth of Non-Symmorphic Materials: Applications to an Eight-Fold Fermion Candidate
Chemistry of Materials ( IF 7.2 ) Pub Date : 2020-06-16 , DOI: 10.1021/acs.chemmater.0c01721
Tanya Berry _{1,

2} , Lucas A. Pressley _{1,

2} , W. Adam Phelan _{1,

2} , Thao T. Tran _{1,

2,

3} , Tyrel M. McQueen _{1,

2,

4}

Affiliation

Materials with nonsymmorphic symmetries have many applications and have recently come to the forefront as possibly harboring new topological states of matter, such as 8-fold fermions. Here, we report the single crystal growth of Bi₂CuO₄ using the traveling solvent floating zone technique. Using laser heating combined with a 0.875 Bi₂CuO₄:0.125 Bi₂O₃ solvent, we produce untwinned single crystal pieces. Three-dimensional X-ray microcomputed tomography is used to probe the fundamental origins of twinning, grain formation, and growth. Powder X-ray diffraction and Laue diffraction show that Bi₂CuO₄ crystallizes in the space group P4/ncc (#130), orders antiferromagnetically with T_N = 43 K, and, combined with comparisons to the literature, demonstrate the crystallinity and reproducibility of the synthesis. The entropy lost at the magnetic phase transition is ΔS_mag = 0.25 ln(2); it arises from a high anisotropy in the magnetic interactions. We carry out a symmetry analysis demonstrating that Bi₂CuO₄’s magnetic order implies a rich breaking of the parent 8-fold symmetric states. Our results provide a roadmap for the creation of future magnetic derivatives of 8-fold, double Dirac single crystals and related quantum states of matter with nonsymmorphic symmetries. This approach also offers guidance on improving the single growth of nonsymmorphic materials from cuprates to van der Waals solids.

中文翻译：

非同形材料的激光增强单晶生长：在八倍费米子候选人中的应用。

具有非对称对称性的材料有许多应用，并且最近成为最前沿，因为它们可能具有新的物质拓扑状态，例如8倍费米子。在这里，我们报告使用行进溶剂浮区技术的Bi ₂ CuO ₄单晶生长。通过将激光加热与0.875 Bi ₂ CuO ₄：0.125 Bi ₂ O ₃溶剂结合使用，我们可以生产未缠绕的单晶片。三维X射线计算机断层扫描技术用于探测孪晶，晶粒形成和生长的基本起源。粉末X射线衍射和Laue衍射显示Bi ₂ CuO ₄在空间群中结晶P4 / ncc（＃130），反铁磁性为T _N = 43 K，并且与文献比较相结合，证明了合成的结晶度和可重复性。磁性相变处的熵损失为ΔS _mag = 0.25 ln（2）；它是由磁相互作用中的高各向异性引起的。我们进行对称分析，证明Bi ₂ CuO ₄的磁阶意味着母体8倍对称状态的丰富断裂。我们的结果为创建未来的8倍双Dirac单晶磁性衍生物和具有非对称对称性的相关物质量子态提供了路线图。该方法还为改善非同形材料从铜酸盐到范德华固体的单一生长提供了指导。

更新日期：2020-07-14

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