论文标题
超高质量的范德华磁铁CRSBR中揭示的三阶段磁相变过
A three-stage magnetic phase transition revealed in ultrahigh-quality van der Waals magnet CrSBr
论文作者
论文摘要
当今的范德华（Van der Waals）（VDW）磁铁正在受到不断增长的关注，因为它们在低维磁性的基本研究中的重要性和在Spintronic设备中的潜在应用。 VDW磁体的高晶体质量是维持固有磁性和电子特性的关键，尤其是当将其去角质至2D极限时。在这里，使用直接蒸气 - 固定合成方法合成了超高质量的气稳定VDW CRSBR晶体。通过X射线衍射，第二次谐波产生和扫描透射电子显微镜，在从亚MM到原子分辨率的长度尺度上已经彻底证明了高的单晶度和空间均匀性。更重要的是，这些超高质量CRSBR晶体的特定热量测量结果显示，在冷却后，在185k，156k和132k处的三个热力学异常均显示出磁性阶段的阶段开发，这也与磁性化和运输结果证实了。我们的超高质量CRSBR可以很容易地将其剥落到单层和双层，并为将它们集成到异质结构中，以进行旋转和磁磁性和磁性电磁应用。
van der Waals (vdW) magnets are receiving ever-growing attention nowadays due to their significance in both fundamental research on low-dimensional magnetism and potential applications in spintronic devices. High crystalline quality of vdW magnets is key for maintaining intrinsic magnetic and electronic properties, especially when exfoliated down to the 2D limit. Here, ultrahigh-quality air-stable vdW CrSBr crystals are synthesized using the direct vapor-solid synthesis method. The high single crystallinity and spatial homogeneity have been thoroughly evidenced at length scales from sub-mm to atomic resolution by X-ray diffraction, second harmonic generation, and scanning transmission electron microscopy. More importantly, specific heat measurements of these ultrahigh quality CrSBr crystals show three thermodynamic anomalies at 185K, 156K, and 132K, revealing a stage-by-stage development of the magnetic order upon cooling, which is also corroborated with the magnetization and transport results. Our ultrahigh-quality CrSBr can further be exfoliated down to monolayers and bilayers easily, paving the way to integrate them into heterostructures for spintronic and magneto-optoelectronic applications.
