Absence of magnetic order in (Ba, K)BiO3

The recent discovery1,2 of superconductivity in the three-dimensional perovskite system (Ba, K)BiO3 has added a new group of compounds to the family of high-transition-temperature (high-Tc) superconductors. (Ba, K)BiO3 contains a three-dimensional BiO network rather than the CuO planes found in two-dimensional high-Tc systems such as YBa2Cu3O7, (La1.85Sr0.15)CuO4, Bi–Ca–Sr–Cu–O and Tl–Ba–Ca–Cu–O. There are, however, a few key features shared by …