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arXiv 2103.15801cond-mat.mes-hallcond-mat.mtrl-sci
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磁倾斜引起的MnBi2Te4反常霍尔效应的拓扑响应

Topological response of the anomalous Hall effect in MnBi2Te4 due to magnetic canting

S. -K. Bac, K. Koller, F. Lux, J. Wang, L. Riney, K. Borisiak, W. Powers, M. Zhukovskyi, T. Orlova, M. Dobrowolska, J. K. Furdyna, N. R. Dilley, L. P. Rokhinson… 展开作者

S. -K. Bac, K. Koller, F. Lux, J. Wang, L. Riney, K. Borisiak, W. Powers, M. Zhukovskyi, T. Orlova, M. Dobrowolska, J. K. Furdyna, N. R. Dilley, L. P. Rokhinson, Y. Mokrousov, R. J. McQueeney, O. Heinonen, X. Liu, B. A. Assaf

摘要:

三维(3D)补偿MnBi2Te4是反铁磁的,但在中间场经历自旋翻转转变,导致在饱和之前的倾斜相。在这项工作中,我们的实验表明,异常霍尔效应(AHE)在MnBi 2Te 4起源于一个拓扑响应,是敏感的垂直磁矩和它的倾斜角。通过分子束外延合成,使我们能够获得一个大面积的准3D 24层MnBi2Te4与接近完美的补偿,主机的相图中观察到的散装,我们利用探测AHE。这种AHE被认为是表现出反铁磁响应在低磁场,并在中间领域通过表面和体自旋翻转过渡到饱和的一个明确的演变。在整个演变过程中,AHE相对于磁化强度是超线性的,而不是预期的线性关系。我们发现,这种差异是有关的倾斜角,符合晶体的对称性。我们的研究结果表明,新的拓扑响应可能会发现在非共线铁磁,反铁磁相。

英文摘要:

Three-dimensional (3D) compensated MnBi2Te4 is antiferromagnetic, but undergoes a spin-flop transition at intermediate fields, resulting in a canted phase before saturation. In this work, we experimentally show that the anomalous Hall effect (AHE) in MnBi2Te4 originates from a topological response that is sensitive to the perpendicular magnetic moment and to its canting angle. Synthesis by molecular beam epitaxy allows us to obtain a large-area quasi-3D 24-layer MnBi2Te4 with near-perfect compensation that hosts the phase diagram observed in bulk which we utilize to probe the AHE. This AHE is seen to exhibit an antiferromagnetic response at low magnetic fields, and a clear evolution at intermediate fields through surface and bulk spin-flop transitions into saturation. Throughout this evolution, the AHE is super-linear versus magnetization rather than the expected linear relationship. We reveal that this discrepancy is related to the canting angle, consistent with the symmetry of the crystal. Our findings suggests that novel topological responses may be found in non-collinear ferromagnetic, and antiferromagnetic phases.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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