Electronic structure and oxidation states in high-pressure synthesized isostructural CeCN and TbCN
This study employs DFT+U and DFT+DMFT calculations to reveal that despite being isostructural high-pressure synthesized compounds, CeCN and TbCN exhibit distinct electronic properties—CeCN being an insulator with Ce in a 4+ oxidation state and TbCN being a metal with Tb in a 3+ oxidation state—demonstrating how the polymeric C-N network accommodates different lanthanide oxidation states and modulates electronic behavior.