Abstract 11 November 2015

Hunting for spin liquids in two-dimensional quantum magnets

Alexander Tsirlin, Experimental Physics VI, Center for Electronic Correlations and Magnetism, Univ. of Augsburg

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:

(i) real-world manifestations of the Heisenberg model on the frustrated square lattice in vanadium oxides;

(ii) novel physics of the Heisenberg model on the kagome lattice probed in copper minerals;

(iii) 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.



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