Effects of pressure on electrical property of BaIrO3

The in situ high-pressure measurements of electrical resistivity versus temperature for weak ferromagnetic BaIrO3 have been performed, using a Cu–Be piston–cylinder-type apparatus up to 1.0 GPa at 80–300 K. The electrical resistivity is increasing with pressure. The pressure derivative of Curie temperature ∂Tc/∂P∂Tc/∂P is equal to −6.1(2) K/GPa, and the relative pressure dependence ∂lnTc/∂P∂lnTc/∂P is equal to −3.4(1)%/GPa, which indicates that BaIrO3 is a weak itinerant ferromagnet.