Unveiling the superconducting mechanism of Ba_{0.51}K_{0.49}BiO_3

Bismuthates were the first family of oxide high-temperature superconductors, exhibiting superconducting transition temperatures (Tc) up to 32K, but the superconducting mechanism remains under debate despite more than 30 years of extensive research. Our angle-resolved photoemission spectroscopy studies on Ba_{0.51}K_{0.49}BiO_3 reveal an unexpectedly 34% larger bandwidth than in conventional density functional... Show more