[Publication/Press]Record-high transverse magnetic thermoelectric conductivity observed at room temperature
- Apr 30
- 1 min read
Updated: May 21
Our research on the magnetic flat-band system GdCo5 has been published in Advanced Materials. This work was led by former Project Assistant Professor Dr. Susumu Minami (currently Assistant Professor at Kyoto University), and involved collaborative spectroscopic measurements with Prof. Takafumi Sato’s team at Tohoku University, together with theoretical contributions from Prof. Ryotaro Arita’s team at the University of Tokyo.
In this study, we discovered that GdCo5 exhibits the highest transverse magneto-thermoelectric conductivity ever reported at room temperature. By combining spectroscopic experiments with theoretical calculations, we revealed the origin of this giant room-temperature response: itinerant flat bands generated by quantum interference of electronic wave functions on a stacked honeycomb–kagome lattice.
Remarkably, the work provides experimental evidence for itinerant flat bands in a magnetic material and demonstrates how such electronic structures can dramatically enhance Berry-curvature-driven transport phenomena. Our findings establish a new design principle for magnetic quantum materials with enhanced thermoelectric functionalities.
Publication Information:
Susumu Minami, Yangming Wang, Seigo Souma, Hiroto Nakamura, Akito Sakai, Takumi Osumi, Hang Su, Hikaru Watanabe, Shun'ichiro Kurosawa, Rikuto Oiwa, Daisuke Nishio-Hamane, Kosuke Nakayama, Takuya Nomoto, Ryotaro Arita, Takafumi Sato, Satoru Nakatsuji
Evidence for Itinerant Ferromagnetic Flat Bands Producing Large Transverse Responses
Also, check out the press release on this work:
(Left) The crystal structure of GdCo5 and (Right) theoretical calculations (red surfaces) and experimental measurements (red dots and heatmap) of the flat band responsible for the giant transverse magnetic thermoelectric conductivity. Adapted from the official press release.