Hybrid crystals of cuprates and iron-based superconductors

We propose two possible new compounds, Ba_2CuO_2Fe_2As_2and K_2CuO_2Fe_2Se_2, which hybridize the building blocks of two high temperature superconductors, cuprates and iron-based superconductors. These compounds consist of square CuO_2 layers and antifluorite-type Fe_2X_2(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 Tc superconductivity.