In quantum spin liquid research, thin films are an attractive arena that enables the control of magnetic interactions via epitaxial strain and two-dimensionality, which are absent in bulk crystals. Here, as a promising candidate for the development of quantum spin liquids in thin films, we propose a robust ilmenite-type oxide with a honeycomb lattice of edge-sharing IrO₆ octahedra artificially stabilised by superlattice formation using the ilmenite-type antiferromagnetic oxide MnTiO₃. Stabilised sub-unit-cell-thick Mn–Ir–O layers are isostructural to MnTiO₃ and have an atomic arrangement corresponding to ilmenite-type MnIrO₃. By performing spin Hall magnetoresistance measurements, we observe that antiferromagnetic ordering in the ilmenite Mn sublattice is suppressed by modified magnetic interactions in the MnO₆ planes via the IrO₆ planes. These findings contribute to the development of two-dimensional Kitaev candidate materials, accelerating the discovery of exotic physics and applications specific to quantum spin liquids.

在量子自旋液体研究中，薄膜是一个诱人的领域，可以通过外延应变和二维来控制磁相互作用，而在大体积晶体中是不存在的。在此，作为开发薄膜中的量子自旋液体的有前途的候选者，我们提出了一种坚固的钛铁矿型氧化物，其具有通过使用钛铁矿型反铁磁性氧化物MnTiO ₃通过超晶格形成人工稳定的边缘共享的IrO ₆八面体的蜂窝晶格。。稳定的亚晶胞厚Mn–Ir–O层与MnTiO ₃同构，并且具有与钛铁矿型MnIrO ₃对应的原子排列。通过执行自旋霍尔磁阻测量，我们观察到钛铁矿Mn亚晶格中的反铁磁有序性受到MnO ₆平面中经由IrO ₆平面的磁性相互作用的抑制。这些发现为二维Kitaev候选材料的开发做出了贡献，加速了奇异物理学的发现和量子自旋液体特有的应用。