The electronic and structural phase diagram of heavily doped La2-xSrxCuO4 (0.15x0.3) is reexamined. We demonstrate that the disappearance of superconductivity in overdoped La2-xSrxCuO4 is associated with an orthorhombic to tetragonal structural phase transition near x=0.2, implying a relationship between superconductivity and subtle structural change. The bulk superconducting phase is thus confined to a much narrower composition range than believed. A complete solid solution of La and Sr is observed in the composition range investigated.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)