High temperature antiferromagnetism in ultrathin SrRu2O6 nanosheets

Abstract

The quest for room-temperature nanoscale magnets remains a central challenge, driven by their promising applications in quantum technologies. Layered $4d$ and $5d$ transition metal oxides with high magnetic ordering temperatures offer significant potential in this context. We explore ultrathin \ce{SrRu2O6} nanosheets using first-principles calculations, complemented by the classical Heisenberg Monte Carlo simulations. Remarkably, these nanosheets exhibit robust antiferromagnetic ordering with Néel temperatures exceeding 430 K, despite the enhanced spin fluctuations characteristic of two-dimensional systems. Surface-termination-induced intrinsic charge doping introduces complexity to the magnetism, resulting in an insulator-to-metal transition and renormalized Néel temperatures in doped systems. A detailed microscopic analysis reveals distinct mechanisms underlying the magnetic behavior in electron- and hole-doped nanosheets. These findings provide a foundation for advancing theoretical and experimental studies in the largely unexplored realm of correlated oxides at the two-dimensional limit.

12 pages, 7 figures

References in corpus (11)

• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Magnetic order in $\alpha$-RuCl${}_3$: a honeycomb lattice quantum magnet with strong spin-orbit coupling
• Suppression of magnetic ordering in XXZ-type antiferromagnetic monolayer NiPS3
• Electrons and phonons in single layers of hexagonal indium chalcogenides from ab initio calculations
• Magnetically driven metal-insulator transition in NaOsO3
• Spin waves and spin-state transitions in a ruthenate high-temperature antiferromagnet
• Evaluating the exfoliation of two-dimensional materials with a Green's function surface model
• Electronic structure and the origin of the high ordering temperature in SrRu2O6
• DFT+DMFT study on soft moment magnetism and covalent bonding in SrRu${}_2$O${}_6$
• Antiferromagnetism in two-dimensional materials: progress and computational challenges
• Long-range anisotropic Heisenberg ferromagnets and electrically tunable ordering