Directional Anomalous Skin Effect in ReO₃

Abstract:

Rhenium oxide (ReO₃) is one of the most highly conducting metals, and has the lowest reported low-temperature residual resistivity of any oxide material. This property endows it with a remarkably long low-temperature electronic mean free path, comparable to those seen in the ultrapure delafossites. In the quasi-2D delafossite material palladium colbaltate (PdCoOâ‚‚), recent broadband microwave spectroscopy studies have observed a novel directional anomalous skin effect (ASE).