Research report 2022 - Max Planck Institute for Solid State Research
Cationic perovskite superconductor from high-pressure synthesis
Kim, Minu; Wedig, Ulrich; Takagi, Hidenori
SummaryQuantum materials with unprecedented properties are often stabilized under high pressures. Here we present the discovery of superconductivity at Tc = 15 K in new perovskite antimonates Ba1−xKxSbO3 (BKSO) synthesized at a high pressure of 12 GPa. The sibling perovskites Ba1−xKxBiO3 (BKBO) are known as anionic high-Tc superconductors with even higher Tc = 30 K. The distribution of valence electrons onto the cations (Sb or Bi) and ligands (O) is slightly different in BKSO compared to BKBO. Metal-oxygen covalency is suggested to become more important in BKSO.