Crystal-chemical origins of the ultrahigh conductivity of metallic delafossites.

ABSTRACT: Despite their highly anisotropic complex-oxidic nature, certain delafossite compounds (e.g., PdCoO₂, PtCoO₂) are the most conductive oxides known, for reasons that remain poorly understood. Their room-temperature conductivity can exceed that of Au, while their low-temperature electronic mean-free-paths reach an astonishing 20 μm. It is widely accepted that these materials must be ultrapure to achieve this, although the methods for their growth (which produce only small crystals) are not typically capable of such. Here, we report a different approach to PdCoO₂ crystal growth, using chemical vapor transport methods to achieve order-of-magnitude gains in size, the highest structural qualities yet reported, and record residual resistivity ratios ( > 440). Never

SUBMITTER: Zhang Y 

PROVIDER: S-EPMC10869826 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature