Available pseudopotentials:

Ir.pbe-n-van.UPF   (details)

	 Perdew-Burke-Ernzerhof (PBE) exch-corr
	 nonlinear core-correction
	 Vanderbilt ultrasoft

Ir.pw91-n-van.UPF   (details)

	 Perdew-Wang 91 gradient-corrected functional
	 nonlinear core-correction
	 Vanderbilt ultrasoft

Ir.pbe-n-rrkjus.UPF   (details)

	 Perdew-Burke-Ernzerhof (PBE) exch-corr
	 nonlinear core-correction
	 Rabe Rappe Kaxiras Joannopoulos (ultrasoft)