Transport evidence for the orbital Nernst effect
En palabras de los autores
Abstract Orbital Hall effects have recently attracted significant attention for generating substantial orbital angular momentum currents in both strong- and weak-spin-orbit-coupling materials. Despite extensive theoretical and experimental progress on the orbital Hall effect, its thermal counterpart, in which a temperature gradient drives a transverse orbital current, known as the orbital Nernst effect, has remained experimentally elusive. Here, we report the first experimental evidence for the orbital Nernst effect by measuring the magneto-thermopower in the yttrium iron garnet (YIG)/Pt/CuO x heterostructures. Through systematic comparison with the YIG/Pt and YIG/CuO x heterostructures, we show that both the magneto-thermopower and the magnetoresistance for YIG/Pt/CuO x are markedly enhanced due to the contributions from the orbital Nernst effect and the orbital Hall effect in CuO x , respectively. Our experimental evidence for the orbital Nernst effect supports the orbital degree of freedom as a promising route for heat-energy harvesting and orbital angular momentum thermal transport in earth-abundant materials.
Apareció: jueves, 24 de septiembre. Nature Communications. Revista con revisión por pares.