Aferroid Cuprate Alloy

Aferroid Cuprate Alloy (ACA) is a family of chemical compounds containing afferoid cuprates. These cuprates are made from cheap minerals and exhibit superconductivity under relatively high temperatures. In 2218 ACA-k42 was reported to have a Tcof ~198 K, the highest ever to be reached by a material not containing any oscillated compounds.

Aferroid cuprate
An aferroid cuprate is strictly defined as a cuprate also containing thorium, iron and aluminium (alferrium became aferrium).