Local spin susceptibility of the S=12 kagome lattice in ZnCu 3 (OD) 6 Cl 2

作者：Takashi Imai, M. Fu, T. H. Han, Y. S. Lee · 发表于：Physical Review B · 年份：2011 · DOI：10.1103/physrevb.84.020411 · 被引用次数：52 · 研究领域：Advanced Condensed Matter Physics、Physics of Superconductivity and Magnetism、Topological Materials and Phenomena

We report a single-crystal $^{2}\mathrm{D}$ NMR investigation of the nearly ideal spin $S=1/2$ kagome lattice ZnCu${}_{3}$(OD)${}_{6}$Cl${}_{2}$. We successfully identify $^{2}\mathrm{D}$ NMR signals originating from the nearest neighbors of Cu${}^{2+}$ defects occupying Zn sites. From the $^{2}\mathrm{D}$ Knight-shift measurements, we demonstrate that weakly interacting Cu${}^{2+}$ spins at these defects cause the large Curie-Weiss enhancement toward $T=0$ commonly observed in the bulk susceptibility data. We estimate the intrinsic spin susceptibility of the kagome planes by subtracting defect contributions, and explore several scenarios.