Dr Tanmoy Chakrabarty, Assistant Professor, Physics, SIAS, gave an oral presentation about his research work at the International Conference on Magnetic Materials and Applications (ICMAGMA2025) organised by the Magnetics Society of India (MSI) in collaboration with the Indian Institute of Science (IISc), Bangalore. The conference was held from February 12-14, 2025, at the IISc campus in Bengaluru, India. The title of Dr Chakrabarty’s talk was , ‘31P NMR studies of the 1/3 depleted 2D kagomé lattice system’.
Abstract of the talk
Subtle interactions in low-D magnets often result in novel states in matter. In this work the team has carried on the bulk and 31P NMR measurements and (DFT+U) electronic structure calculations on the single crystals of Cu-based S=1/2 compound BaCu2(PO4)2(H2O). Based on the hopping parameters calculated from DFT, they find the spin network of the titled compound to be a 2D layer of 1/3-depleted anisotropic kagomé lattice with the magnetic couplings J1, J2, J3, and J4. They observe a broad maximum in the magnetic susceptibility however, the 31P NMR local probe measurements feature an additional sharp magnetic anomaly which confirms the presence of a magnetic transition at TN = 10.5 K. While 1/T1 falls very steeply with temperature below TN, it follows a sublinear power-law behaviour above TN, indicating the presence of dynamic short-range correlations. All these features confirm the complex 2D spin network in this compound.