Petrovic, Pagliuso, Hundley, Movshovich, Sarrao, Thompson, Fisk and Monthoux reported heavy-fermion superconductivity in CeCoIn₅ at 2.3 K in 2001.
Its 2.3 K critical temperature is the highest among all Ce-based heavy-fermion superconductors; the tetragonal structure is viewed as CeIn₃ with an added CoIn₂ layer.
Bianchi et al. (2003) measured upper critical fields of 11.6 T along [100] versus 4.95 T along [001] and proposed an FFLO state near the critical field.