Skip to Content

Optical investigation of an antiferromagnetic organic superconductor


Organic salt kappa-(BETS) 2 FeBr 4 is a unique compound in which local moment  antiferromagnetism of Fe 3+ ions (below Neel temperature T N of 2.5 K) coexists with
bulk superconductivity (below the superconducting transition temperature of T C =1.1 K).  After a general introduction to the optical properties of conventional superconductors I will discuss  the results of our experimental investigation of the optical properties of kappa-(BETS) 2 FeBr 4 in which we probe the temperature regime of the coexistence as well as the normal state.