标题： 金属分子自旋Kondo晶格界面的挫败效应和大反常Nernst效应的实验观察 显示英文标题

标题： Experimental observation of frustration and large anomalous Nernst effect in metallo-molecular spin Kondo lattice interfaces

摘要： 在Kondo自旋晶格系统中的挫折导致了手性自旋液体和偏离费米液体行为的奇异金属的出现，当它们不在反铁磁基态时。 在二维（2D）中，由于预期与体系统有偏差，Kondo自旋晶格最近在范德华系统中被观察到。 超分子晶格的金属分子界面也被建议作为另一种二维Kondo自旋晶格系统，在扫描隧道光谱（STS）研究中已经展示了单离子Kondo效应以及自旋位点间的Ruderman-Kittel-Kasuya-Yosida（RKKY）耦合。 在此，超越金属分子界面的超高真空STS研究，我们报告了一种亚稳的受挫反铁磁状态，具有超高的自旋冻结温度（T_f），范围从240 K到300 K，在高度取向的Pt(111)和Pt(111)/Co薄膜与在超高真空10^(-10) mbar下生长的有机分子界面。 在自旋冻结转变附近，我们在Pt/Co/分子异质结构中测量到了一个大的异常能斯特效应（ANE），其能斯特系数至少为3微伏每开尔文。我们的结果表明，一种具有高温量子关联的二维金属分子Kondo自旋晶格，在室温附近表现出超越磁化的ANE。 显示英文摘要

摘要： Frustration in Kondo spin lattice systems has led to the emergence of both spin liquids that could be chiral and strange metals that deviate from Fermi liquid behaviour when not in their antiferromagnetic ground state. In two dimensions (2D), where deviations from bulk systems are expected, Kondo spin lattice emergence have recently been observed in van der Waals systems. Metallo-molecular interfaces of supramolecular lattices have also been suggested as an alternative 2D Kondo spin lattice system where a single-ion Kondo effect as well as an inter spin-site Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling has been demonstrated in scanning tunnelling spectroscopy (STS) studies. Here, going beyond ultrahigh vacuum STS studies on metallo-molecular interfaces, we report a metastable frustrated antiferromagnetic state, with ultra-high spin freezing temperatures (T_f), ranging from 240 K to 300 K on the interfaces of highly textured Pt(111) and Pt(111)/Co films with organic molecules grown in ultra-high vacuum 10^(-10) mbar. In the vicinity of the spin-freezing transition, we measure a large anomalous Nernst effect (ANE) in the Pt/Co/molecular heterostructure, with a Nernst coefficient of at least 3 microV per K. Our results suggest a 2D metallo-molecular Kondo spin lattice with high temperature quantum correlations where an ANE beyond magnetisation is manifested around room temperature.