Karl G. Koster

IV. EXPERIMENTAL PROCEDURE Single crystals of Re4Si7 were synthesized in a floating zone crystal growth process as described previously.1010. M. R. Scudder, B. He, Y. Wang, A. Rai, D. G. Cahill, W. Windl, J. P. Heremans, and J. E. Goldberger, Energy Environ. Sci. 14, 4009 (2021). https://doi.org/10.1039/D1EE00923K Transport properties along in-plane and cross-plane were measured in a modified Janis high temperature cryostat system.

The recent discovery that specific materials can simultaneously exhibit n-type conduction and p-type conduction along different directions of the single crystal has the potential to impact a broad range of electronic and energy-harvesting technologies. Here, we establish the chemical design principles for creating materials with this behavior. First, we define the single-carrier and multicarrier mechanisms for axis-dependent conduction polarity and their identifying band structure fingerprints.