Field dependence of magnetic correlations in the 2D van der Waals magnet CrI3

Two-dimensional (2D) van der Waals (vdW) magnets have become the subject of intense interest due to their rich diversity of optical,
electronic and topologically states. CrI3 is a well known example. In a recent study combining µSR and other techniques, it was revealed
that bulk CrI3 hosts several magnetic phases with distinct transitions. Remarkably, Tc does not correspond to long range order in the full
volume but rather to a partial transition. Here we aim to continue our study of magnetic correlations in CrI3. Our previous SANS
measurements clearly identified distinct magnetic phases with different correlation length. Here we want to obtain a better understanding
of these phases by studying the field dependence of the magnetic contrast in a set of single crystals.

二维（2D）范德华（van der Waals, vdW）磁体因其丰富多样的光学、电子与拓扑态而受到广泛关注，其中CrI3是典型代表。近期一项结合μ子自旋弛豫（µSR）与其他实验技术的研究表明，体相CrI3存在多种具有不同相变特征的磁相。值得注意的是，其居里转变温度（Tc）并不对应整体体积的长程磁有序，而是对应部分相变过程。本研究旨在延续我们对CrI3中磁关联特性的研究：此前我们通过小角中子散射（Small Angle Neutron Scattering, SANS）测量，已明确分辨出多种具有不同关联长度的特征磁相。本研究拟通过分析一批单晶样品的磁衬度磁场依赖关系，进一步深化对上述磁相的认知。