钛铁矿型MnTiO $_3$超晶格中IrO $_6$八面体蜂窝晶格的稳定化
Stabilization of a honeycomb lattice of IrO$_6$ octahedra in superlattices with ilmenite-type MnTiO$_3$
摘要：
在对量子自旋液体的探索中，薄膜有望通过利用外延应变和二维性为控制实际材料中复杂的磁相互作用开辟道路。然而，与传统薄膜生长方法兼容的材料在很大程度上仍未开发。作为一个有前途的候选人对物质化的量子自旋液体在薄膜中，我们在这里提出了一个强大的钛铁矿型氧化物与蜂窝晶格的边缘共享IrO $_6$八面体人工稳定的超晶格形成与钛铁矿型反铁磁氧化物MnTiO $_3$。稳定的亚单位晶胞厚的Mn-Ir-O层与MnTiO $_3$同构，具有与尚未发现的钛铁矿型MnTiO $_3$对应的原子排列。通过自旋霍尔磁电阻测量，我们发现，反铁磁有序的钛铁矿Mn亚晶格中的MnO $_6$平面通过IrO $_6$平面的修改的磁相互作用被抑制。这些发现为创建二维Kitaev候选材料奠定了基础，加速了量子自旋液体特有的奇异物理和应用的发现。
英文摘要：
In the quest for quantum spin liquids, thin films are expected to open the way for the control of intricate magnetic interactions in actual materials by exploiting epitaxial strain and two-dimensionality. However, materials compatible with conventional thin-film growth methods have largely remained undeveloped. As a promising candidate towards the materialization of quantum spin liquids in thin films, we here present a robust ilmenite-type oxide with a honeycomb lattice of edge-sharing IrO$_6$ octahedra artificially stabilized by superlattice formation with an ilmenite-type antiferromagnetic oxide MnTiO$_3$. The stabilized sub-unit-cell-thick Mn-Ir-O layer is isostructural to MnTiO$_3$, having the atomic arrangement corresponding to ilmenite-type MnTiO$_3$ not discovered yet. By spin Hall magnetoresistance measurements, we found that antiferromagnetic ordering in the ilmenite Mn sublattice is suppressed by modified magnetic interactions in the MnO$_6$ planes via the IrO$_6$ planes. These findings lay the foundation for the creation of two-dimensional Kitaev candidate materials, accelerating the discovery of exotic physics and applications specific to quantum spin liquids.
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