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The linearized augmented plane wave (LAPW) method was used for spin-polarized self-consistent electronic structure calculations of CeBa 2 Cu 3 O 7 (not synthesized as a single phase yet) and compared with three other members of the ReBa 2 Cu 3 O 7 (denoted as Re123) family of compounds: Y123 (superconducting), Nd123 (superconducting) and Pr123 (potentially-superconducting). The obtained band structures are qualitatively similar. We hypothesize that the spin-split band structure observed in Pr123 and Ce123 could indicate the potential off-stoichiometry, substitutional defects and as a consequence the suppression of superconductivity in the former, and the failure of single phase synthesis in the last system.

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