Exploration for novel magnetism in some 3d/4d based triangular and honeycomb lattice materials
by Dr. Ramender Kumar Sharma (Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai)
Tuesday, July 26, 2016 from to (Asia/Kolkata)
The exploration for unconventional magnetism in real materials has been the subject of last few decades. Frustration is one of the ways to realize some exotic ground states (spin liquids, spin ice, spin glass among others), and emerges when it becomes difficult for spins to minimize their exchange energies simultaneously. Sometimes, an intricate balancing among various energy scales such as (i) superexchange (ii) crystal field splitting and (iii) spin-orbit coupling or SOC, also helps in realizing some novel ground states. I will talk about the structural and ground state properties of (i) triangular lattice material Sc2Ga2CuO7, which retains a quantum spin liquid ground state and (ii) honeycomb lattice materials Ag3LiMn2O6 and Ag3LiRu2O6, though structurally similar, but exhibit an antiferromagnetically ordered and quantum spin liquid state, respectively.