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High-quality single crystals of WTe2 were grown using a Te flux followed by a cleaning step involving self-vapor transport. The method is reproducible and yields consistently higher-quality single crystals than are typically obtained via halide-assisted vapor transport methods. Magnetoresistance (MR) values at 9 tesla and 2 kelvin as high as 1.75 million %, nearly an order of magnitude higher than previously reported for this material, were obtained on crystals with residual resistivity ratio (RRR) of approximately 1250. The MR follows a near B 2 law and, assuming a semiclassical model, the average carrier mobility for the highest-quality crystal was found to be at 2 K. A correlation of RRR, MR ratio and average carrier mobility is found with the cooling rate during the flux growth.

We report the superconducting phase diagram of the hexagonal tungsten bronze (HTB) InxWO3. The InxWO3 samples were prepared by indium deintercalation of the thermodynamically stable parent phase In0.33WO3. By employing this technique, a lowest indium content in the HTB phase of was achieved, which cannot be obtained by conventional solid-state reaction. In addition, accurately and reproducibly controlled indium content and homogeneous samples enable us to perform a systematic study of the physical properties of InxWO3. Most of the InxWO3 samples exhibit a superconducting transition and the highest transition temperature in InxWO3 was observed at . The indium content dependence of shows remarkable similarities to other MxWO3 ( and Rb) HTBs. Our results reveal the universality of physical properties in the HTB family and give a strategy to achieve higher in HTBs.