Colossal anomalous Nernst effect in a correlated noncentrosymmetric kagome ferromagnet.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33771869.
- Also identified by DOI 10.1126/sciadv.abf1467 and PMC identifier 7997519.
- Licence recorded as CC BY-NC.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
The transverse voltage generated by a temperature gradient in a perpendicularly applied magnetic field, termed the Nernst effect, has promise for thermoelectric applications and for probing electronic structure. In magnetic materials, an anomalous Nernst effect (ANE) is possible in a zero magnetic field. We report a colossal ANE in the ferromagnetic metal UCo<sub>0.8</sub>Ru<sub>0.2</sub>Al, reaching 23 microvolts per kelvin. Uranium's 5<i>f</i> electrons provide strong electronic correlations that lead to narrow bands, a known route to producing a large thermoelectric response. In addition, uranium's strong spin-orbit coupling produces an intrinsic transverse response in this material due to the Berry curvature associated with the relativistic electronic structure. Theoretical calculations show that in UCo<sub>0.8</sub>Ru<sub>0.2</sub>Al at least 148 Weyl nodes, and two nodal lines, exist within 60 millielectron volt of the Fermi level. This work demonstrates that magnetic actinide materials can host strong Nernst and Hall responses due to their combined correlated and topological nature.