Depotassiation of K0.62RhO2 and electronic property of the end-product K0.32RhO2 single crystal

KxRhO2, as an isomorphism material to NaxCoO2, is theoretically predicted to have rich physical properties. In this letter, we studied the chemical depotassiation process of K0.62RhO2 crystals to obtain KxRhO2 with x varied from 0.32 to 0.62. And an end-product K0.32RhO2 with single phase determined through XRD refinement belongs to space group P63/mmc (No. 194). Electrical transport, magneto-resistant transport and Hall measurements substantiate that K0.32RhO2 is a multi-band normal metal, which can be well described by Landau Fermi liquid theory. Our finding sheds more light on the preparation and transport properties of layered oxides.