The 'Dark Phase' In Sr2ir1-X Rh X O4 Revealed By Seebeck And Hall Measurements

It was found that, although isovalent, Rh substituted for Ir in Sr2IrO4 may trap one electron inducing effective hole doping of Ir sites. Transport and thermoelectric measurements on Sr2Ir1-x Rh x O4 single crystals presented here reveal the existence of an electron-like contribution to transport, in addition to the hole-doped one. As no electron band shows up in ARPES measurements, this points to the possibility that this hidden electron may delocalize in disordered clusters.