(152460)Superconductivity for potassium doped BaPb_(0.80)Bi_(0.20)O_(3-δ) and BaPb_(0.60)Bi_(0.40)O_(3-δ) with zero electrical resistivity at -11 K

摘要

The perovskites Ba_(1-x)K_xPb_(0.80)Bi_(0.20)O_(3-δ) and Ba_(1-x)K_xPb_(0.60)Bi_(0.40)O_(3-δ) (0.0 < x < 0.4) have been synthesized by traditional solid state method in air. They all crystallize in PI space group. The magnetic susceptibility measurement exhibits the Meissner effect below -12 K for Ba_(1-x)K_xPb_(0.60)Bi_(0.40)O_(3-δ) when x = 0.4. The electrical resistivity of this compound dropped sharply near -12 K, and becomes zero at -11 K.