Growth of metallic delafossite PdCoO2 by molecular beam epitaxy
arXiv:1905.12549 · doi:10.1103/PhysRevMaterials.3.093401
Abstract
The Pd, and Pt based ABO2 delafossites are a unique class of layered, triangular oxides with 2D electronic structure and a large conductivity that rivals the noble metals. Here, we report successful growth of the metallic delafossite PdCoO2 by molecular beam epitaxy (MBE). The key challenge is controlling the oxidation of Pd in the MBE environment where phase-segregation is driven by the reduction of PdCoO2 to cobalt oxide and metallic palladium. This is overcome by combining low temperature (300 °C) atomic layer-by-layer MBE growth in the presence of reactive atomic oxygen with a post-growth high-temperature anneal. Thickness dependence (5-265 nm) reveals that in the thin regime (<75 nm), the resistivity scales inversely with thickness, likely dominated by surface scattering; for thicker films the resistivity approaches the values reported for the best bulk-crystals at room temperature, but the low temperature resistivity is limited by structural twins. This work shows that the combination of MBE growth and a post-growth anneal provides a route to creating high quality films in this interesting family of layered, triangular oxides.
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- Metallic delafossite thin films for unique device applications
- Determination of the phase coherence length of PdCoO nanostructures
- Emergent magnetism with continuous control in the ultrahigh conductivity layered oxide PdCoO2
- Effective reduction of PdCoO2 thin films via hydrogenation and sign tunable anomalous Hall effect
- Theoretical design of highly correlated electron states in delafossite heterostructures
- Diffusion-assisted molecular beam epitaxy of CuCrO thin films
- Disorder-enhanced effective masses and deviations from Matthiessen's rule in PdCoO thin films
- Self-regulated growth of candidate topological superconducting parkerite by molecular beam epitaxy
- Control of Impurity Phase Segregation in a PdCrO/CuCrO Heterostructure