Title: MnRhBi3: A Cleavable Antiferromagnetic Metal Show Chinese title

Title: MnRhBi3：一种可剥离的反铁磁金属

Abstract: Cleavable metallic antiferromagnets may be of use for low-dissipation spintronic devices; however, few are currently known. Here we present orthorhombic MnRhBi3 as one such compound and present a thorough study of its physical properties. Exfoliation is demonstrated experimentally, and the cleavage energy and electronic structure are examined by density functional theory calculations. It is concluded that MnRhBi3 is a van der Waals layered material that cleaves easily between neighboring Bi layers, and that the Bi atoms have lone pairs extending into the van der Waals gaps. A series of four phase transitions are observed below room temperature, and neutron diffraction shows that at least two of the transitions involve the formation of antiferromagnetic order. Anomalous thermal expansion points to a crystallographic phase transition and/or strong magnetoelastic coupling. This work reveals a complex phase evolution in MnRhBi3 and establishes this cleavable antiferromagnetic metal as an interesting material for studying the interplay of structure, magnetism, and transport in the bulk and ultrathin limits as well as the role of lone pair electrons in interface chemistry and proximity effects in van der Waals heterostructures. Show Chinese abstract

Abstract: 可剥离的金属反铁磁体可能对低耗散自旋电子器件有用;然而，目前知道的很少。 在这里，我们介绍了正交晶系的MnRhBi3作为一种这样的化合物，并对其物理性质进行了深入研究。 实验上展示了剥离过程，并通过密度泛函理论计算检查了剥离能和电子结构。 结论是MnRhBi3是一种范德华层状材料，在相邻的Bi层之间容易剥离，且Bi原子的孤对电子延伸到范德华间隙中。 在室温以下观察到一系列四个相变，中子衍射表明至少有两个相变涉及反铁磁序的形成。 异常的热膨胀表明存在晶体学相变和/或强磁弹性耦合。 这项工作揭示了MnRhBi3中的复杂相变演化，并确立了这种可剥离的反铁磁金属作为研究体材料和超薄极限下结构、磁性和输运相互作用以及孤对电子在范德华异质结构界面化学和邻近效应中作用的有趣材料。