Magnetic systems with low-dimensional and frustrated geometries of exchange interactions can host unusual ground states, such as spin liquids, where no long-range magnetic order occurs even at zero temperature. The spin-liquid ground state has been predicted for several magnetic models in two dimensions, but its experimental observations are scarce.
In this talk, I will discuss the quest for the spin-liquid ground state in bulk magnetic insulators, where quantum magnetic behavior is observed. The talk will cover several simple frustrated geometries in two dimensions:
real-world manifestations of the Heisenberg model on the frustrated square lattice in vanadium oxides;
novel physics of the Heisenberg model on the kagome lattice probed in copper minerals;
Kitaev model on the honeycomb lattice in layered van-der-Waals crystals of a-RuCl3.
I will demonstrate which challenges the bulk materials present, and which material-specific deviations from the ideal models become relevant when low-temperature magnetism is considered.