Intrinsic Percolative Superconductivity in Heavily Overdoped High Temperature Superconductors
Abstract
Magnetic measurements on heavily overdoped La2-xSrxCuO4, Tl2Ba2CuO6, Bi2Sr2CuO6 and Bi2Sr2CaCu2O8 single crystals reveal a new type magnetization hysteresis loops characterized by the vanishing of usual central peak near zero field. Since this effect has been observed in various systems with very different structural details, it reflects probably a generic behavior for all high temperature superconductors. This easy penetration of magnetic flux can be understood in the picture of percolative superconductivity due to the inhomogeneous electronic state in heavily overdoped regime.
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