Research report 2022 - Max Planck Institute for Solid State Research

Cationic perovskite superconductor from high-pressure synthesis

Kim, Minu; Wedig, Ulrich; Takagi, Hidenori
Quantum 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.

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