Nanowerk November 26, 2024
Materials with axis-dependent conduction polarity (ADCP), which exhibit electron-like and hole-like conduction along distinct crystallographic axes, have garnered interest as potential candidates for effective transverse thermoelectric (TTE) conversion. However, the challenge of designing materials with ADCP is still unresolved. Researchers in Japan conducted experimental and computational investigations on the ADCP in thermopower of WSi single crystals and found that the ADCP stems from the mixed-dimensionality of the Fermi surfaces, characterized by the coexistence of quasi-one-dimensional electron-like and quasi-two-dimensional hole-like sheets. They demonstrated TTE conversion in WSi single crystals by detecting the electromotive force along the perpendicular direction to the temperature gradient. According to the researchers their findings suggest that the concept of mixed-dimensional Fermi surfaces serves as the basic framework for efficient TTE conversion… read more. Open Access TECHNICAL ARTICLE
(a) The measurement setup for the transport properties along the crystallographic direction… Credit: PRX Energy 3, 043007 – 13, November, 2024