Anomalous metallic state: Decisive effect of dilute impurity doping on ferromagnetic BaIrO$_3$ single crystals*

BaIrO$_3$ is a quasi one-dimensional system, where a {CDW} and a ferromagnetic state with T$_{C}$=183K coexist. The ground state of the system is critically linked to the lattice and orbital degrees of freedom due to extended $5d$-orbitals. The central findings of this study are: (1) An occurrence of a 2D-metallic state with a linear temperature dependence of resistivity at low temperatures in slightly oxygen-deficient samples; (2) Unusual temperature dependence of resistivity above the Curie temperature in the rare-earth doped BaIrO3; (3) High sensitivity of the resistivity to applied pressure ($<12$ Kbar), which results in changes in resistivity by a few orders of magnitude in these doped samples. The results of the resistivity, heat capacity, magnetization, thermoelectric power and structural measurements as a function of temperature, magnetic field, and pressure will be presented and discussed.