Magnetotransport in BaIrO$_{3}$

The quasi-one-dimensional monoclinic semiconductor BaIrO$_{3}$ possesses a transition at 177 K characterized by both charge-ordering and ferromagnetism. We have measured the magneto-transport on single crystal samples in fields of up to 7T. We find that the strongly hysteretic positive magnetoresistance (MR) possesses both linear and quadratic contributions. The linear contribution is positive in the full temperature range studied, with a peak below the transition temperature at 150 K. The quadratic MR changes sign at T$_{\mathrm{C}}$, from positive above to negative below. The Hall effect is non-monotonic as a function of field below T$_{\mathrm{C}}$ and we will relate this to the FM order parameter.