grown in magnetic field*

Recent experiments found a massive reduction in the low-temperature resistivity in Sr₂IrO₄ when the crystals were grown in the presence of a magnetic field. Here I will present a comparison of Raman scattering data from normal and field-grown Sr₂IrO₄. The main differences between the two appeared in scattering from magnetic excitations. Two-magnon scattering was significantly broader in the field-grown sample and exhibited unusual temperature dependence. Scattering from single magnons, clearly visible in the normal sample, was completely absent in the field-grown sample down to an energy of at most 5 cm^-1. Latest results including on doped samples will be presented.