Gupta Kriti, Dadwal Arun, Jha Plawan Kumar, Jain Anil, Yusuf S M, Joy Pattayil A, Ballav Nirmalya
Department of Chemistry, Indian Institute of Science Education and Research, Pune 411008, India.
Physical and Materials Chemistry Division, National Chemical Laboratory, Pune 411008, India.
Inorg Chem. 2020 May 4;59(9):6214-6219. doi: 10.1021/acs.inorgchem.0c00315. Epub 2020 Apr 17.
Study on magnetism in two-dimensional (2D) spin-lattices is advancing rapidly. In this work, phase-pure botallackite (Bo) (Cu(OH)Br), a quasi-2D S = 1/2 anisotropic triangular spin-lattice is stabilized over 2D reduced graphene oxide (rGO) nanosheets via simple oxidation-reduction reaction chemistry. In comparison to polycrystalline Bo, such an anchoring resulted in the oriented growth of Bo crystallites in the Bo-rGO system. The Bo-rGO nanocomposite was found to be magnetically active with a Néel transition at ∼8.9 K, crossing over to possible anisotropy at ∼5 K-as revealed by complementary dc and ac susceptibility measurements-an unprecedented observation in the field assigned to an interfacial effect. This work demonstrates the potential usage of nonmagnetic 2D functionalized graphene to significantly modulate the magnetic properties of 2D spin-lattices.
二维（2D）自旋晶格中的磁性研究正在迅速发展。在这项工作中，通过简单的氧化还原反应化学方法，在二维还原氧化石墨烯（rGO）纳米片上稳定了纯相的氯溴铜石（Bo）（Cu(OH)Br），它是一种准二维S = 1/2各向异性三角自旋晶格。与多晶Bo相比，这种锚定作用导致了Bo-rGO体系中Bo微晶的取向生长。通过互补的直流和交流磁化率测量发现，Bo-rGO纳米复合材料具有磁性活性，奈尔转变温度约为8.9 K，在约5 K时转变为可能的各向异性，这是该领域前所未有的观察结果，归因于界面效应。这项工作展示了非磁性二维功能化石墨烯在显著调节二维自旋晶格磁性特性方面的潜在用途。
