Intrinsic percolative superconductivity in heavily overdoped high-temperature superconductors

摘要

Magnetic measurements on heavily overdoped La2-xSrxCuO4, Tl2Ba2CuO6, Bi2Sr2CuO6, Y1-x (Ca-chi)Ba2Cu3O7-delta and Bi2Sr2CaCu2O8 single crystals reveal a new type of magnetization hysteresis loops characterized by the vanishing of the usual central peak near zero field. Since this effect has been observed in various systems with very different structural details, it probably reflects a generic behavior for all high-temperature superconductors. This easy penetration of magnetic flux can be understood in the picture of percolative superconductivity clue to the inhomogeneous electronic state in heavily overdoped regime. [References: 22]