Bi系高温超伝導体の光電子分光

抄録

Angle-resolved photoemission study on hole-concentration dependence in Bi₂Sr₂CaCu₂O₈ high-Tc superconductor has been reported. The result clearly shows that (1) there exist two large Fermi surfaces as predicted from the band structure calculation, (2) the Fermi liquid states giving such large Fermi surfaces are formed by hole-doping, and (3) the hole-doping does not necessarily cause a rigid shift of the Fermi level but creats new electronic states in the charge-transfer gap.