|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Alloys and Compounds for Thermoelectric and Solar Cell Applications X
||Anderson Transition as a Novel Route for High-performance Thermoelectrics
||Fabian Garmroudi, Michael Parzer, Alexander Riss, Andrei Ruban, Sergii Khmelevskyi, Michele Reticcioli, Matthias Knopf, Herwig Michor, Andrej Pustogow, Takao Mori, Ernst Bauer
|On-Site Speaker (Planned)
Twenty-five years ago, Mahan and Sofo derived a mathematical idea for 'the best thermoelectric' − a delta-distribution-shaped transport function, where electrons contributing to transport exist only in an infinitely narrow energy interval. While the authors themselves thought that only approximations to this concept exist in nature, we recognize that this scenario is actually realized at the Anderson transition in an impurity band, i. e. the transition from Anderson-localized to extended quantum states. We present here, for the first time, a significant enhancement of the thermoelectric properties across such a transition in the full-Heusler compound Fe2VAl. This is achieved by controlling the level of atomic disorder and number of antisite defects by high-temperature quenching. Experimental results of the magnetic and transport properties confirm the picture drawn by our ab initio Monte-Carlo simulations and electronic structure calculations, suggesting a new route towards achieving high thermoelectric performance in all kinds of materials.
||Electronic Materials, Energy Conversion and Storage, Computational Materials Science & Engineering