Sr₂RhO₄: a new, clean correlated electron metal

We report the image furnace growth of single crystals of a novel correlated electron metal, the rhodate Sr2RhO4. Suitable annealing treatments result in residual resistivity ratios in excess of 100. Bulk specific heat and magnetic susceptibility have been measured, and both the de Haas-van Alphen and Shubnikov-de Haas effects are observable in the best crystals. The quasi-two-dimensional electronic structure has also enabled a comprehensive study of the electronic structure by angle-resolved photoelectron spectroscopy. The implications of our combined spectroscopic results are discussed.