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VO2, of interest for decades due to both its phenomenology and its potentialapplications, has a monoclinic distortion of the rutile crystal structure atambient temperature that is coupled to its metal-insulator transition (MIT). Incontrast, RuO2 has three electrons more per formula unit, is a metallicconductor, and has an undistorted rutile structure. Here we report a systematicstudy of Ru-doped VO2 (V1-xRuxO2); generally characterizing its crystalstructure, magnetic and electronic properties, and heat capacity. Thecomposition-dependent Wilson ratio is determined. We find that an unusuallyhigh Ru doping value (x=0.8) is required to achieve a metallic state inV1-xRuxO2. No superconductivity was observed down to 0.1 K in the metallicmaterials. We propose a possible understanding for how the insulating state canexist in V1-xRuxO2 at high Ru contents.

Metal-Insulator Transition and Anomalous Lattice Parameters Changes in Ru-doped VO2