Thallium barium calcium copper oxide, or TBCCO, is a family of high-temperature superconductors having the generalized chemical formula TlₘBa₂Caₙ−1CuₙO₂ₙ₊ₘ₊₂. Tl₂Ba₂Ca₂Cu₃O₁₀ was discovered in Prof. Allen M. Hermann's laboratory in the physics... Wikipedia