Hybrid crystals of cuprates and iron-based superconductors

We propose two possible new compounds, Ba₂CuO₂Fe₂As₂ and K₂CuO₂Fe₂Se₂, which hybridize the building blocks of two high temperature superconductors, cuprates and iron-based superconductors. These compounds consist of square CuO₂ layers and antifluorite-type Fe₂X₂ (X=As, Se) layers separated by Ba/K. The calculations of binding energies and phonon spectra indicate that they are dynamically stable, which ensures that they may be experimentally synthesized. The Fermi surfaces and electronic structures of the two compounds inherit the characteristics of both cuprates and iron-based superconductors. These compounds can be superconductors with intriguing physical properties to help to determine the pairing mechanisms of high T_c superconductivity.