Unusual transport phenomena in a topological pyrochlore antiferromagnet

Pyrochlore iridates are topological antiferromagnets renowned for their exotic electronic characteristics stemming from entwined spin-orbit coupling, electronic correlation, and geometrical frustration. They exhibit a magnetic Weyl semimetallic phase (WSM) that is intrinsically coupled with a unique all-in-all-out antiferromagnetic (AFM) order. However, in bulk, the cubic symmetry of pyrochlores strictly enforces the anomalous Hall effect to disappear, hindering the study of emergent transport properties arising from the interplay of the WSM and AFM phases. In this presentation, we report on unusual magneto-transport phenomena emerging in (111)-oriented thin films of pyrochlores iridates. We highlight previously unidentified exotic transport behavior originating from the Weyl nodes and the Fermi-arc surface states. Collectively, our findings suggest that (111)-oriented pyrochlore iridates thin films represent a promising avenue for in-depth exploration of the interplay of relativistic Weyl fermions and magnetism in the synthetic frustrated kagome-triangular lattices.