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Angle resolved photoemission spectroscopy (ARPES) and resistivitymeasurements are used to explore the overdoped region of the high temperaturesuperconductor Bi2Sr2CaCu2O8+delta. We find evidence for a new crossover linein the phase diagram between a coherent metal phase for lower temperatures andhigher doping, and an incoherent metal phase for higher temperatures and lowerdoping. The former is characterized by two well-defined spectral peaks in ARPESdue to coherent bilayer splitting and superlinear behavior in the resistivity,whereas the latter is characterized by a single broad spectral feature in ARPESand a linear temperature dependence of the resistivity.Comment: 4 pages, revtex4, 5 figure

physical review letters

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Crossover from Coherent to Incoherent Electronic Excitations in the Normal State ofBi2Sr2C