Lithium holmium fluoride

Lithium holmium fluoride is a ternary salt with chemical formula LiHoF4. At temperatures below 1.53 K, it is ferromagnetic described by the Ising model, but the interaction coefficients arise through superexchange. Above that temperature, it paramagnetizes. Even at 0 K, LiHoF4 exhibits a quantum phase transition, aligning with an external magnetic field.