论文标题
菱形纳米纪量与锯齿形外围的巨型磁性交换耦合
Giant magnetic exchange coupling in rhombus-shaped nanographenes with zigzag periphery
论文作者
论文摘要
预计具有锯齿形边缘的纳米仪会表现出由于局部边界状态的杂交相互作用和价电子之间的库仑排斥而产生的非平凡的PI磁性。这为探索纳米级的量子磁性提供了一个可调节的平台，并为有机旋转的途径打开了途径。因此，纳米仪的磁稳定性受到弱磁交换耦合的限制，该耦合保持在室温热能以下。在这里，我们报告了大菱形纳米仪的合成，并在黄金和铜面上与锯齿形外围。单分子扫描探针测量结果揭示了纳米谱尺寸增加的新兴磁性旋转底线态。由非弹性电子隧穿光谱确定的最大纳米谱系中的磁交换耦合超过100 MeV或1160 K，它超过了大多数无机纳米材料，并在金属电极上生存了明显的生存。
Nanographenes with zigzag edges are predicted to manifest non-trivial pi-magnetism resulting from the interplay of hybridization of localized frontier states and Coulomb repulsion between valence electrons. This provides a chemically tunable platform to explore quantum magnetism at the nanoscale and opens avenues toward organic spintronics. The magnetic stability in nanographenes is thus far limited by the weak magnetic exchange coupling which remains below the room temperature thermal energy. Here, we report the synthesis of large rhombus-shaped nanographenes with zigzag periphery on gold and copper surfaces. Single-molecule scanning probe measurements unveil an emergent magnetic spin-singlet ground state with increasing nanographene size. The magnetic exchange coupling in the largest nanographene, determined by inelastic electron tunneling spectroscopy, exceeds 100 meV or 1160 K, which outclasses most inorganic nanomaterials and remarkably survives on a metal electrode.
