Abstract :
The magnetic, transport, optical, and structural properties of quasi-one-dimensional BaIrO3 show evidence for the simultaneous onset of electronic density wave formation and ferromagnetism at Tc3=175 K. Two additional features in the chain direction dc conductivity show a sudden change to metallic behavior below Tc2=80 K and then a Mott-like transition at Tc1=26 K. Highly non-linear dc conductivity, optical gap formation at ≈9kBTc3, additional phonon modes, and emergent X-ray satellite structure support density wave formation. Even at very high (30 T) fields the saturation Ir moment is very small, ≈0.04μB/Ir.
