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Crossover from coherent to incoherent electronic excitations in the normal state of Bi2Sr2CaCu2O8

A. Kaminski·S. Rosenkranz·H. M. Fretwell·Z. Li·H. Raffy·M. Randeria·M. R. Norman·J. C. Campuzano
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Abstract

Angle resolved photoemission spectroscopy (ARPES) and resistivity measurements are used to explore the overdoped region of the high temperature superconductor Bi2Sr2CaCu2O8+delta. We find evidence for a new crossover line in the phase diagram between a coherent metal phase for lower temperatures and higher doping, and an incoherent metal phase for higher temperatures and lower doping. The former is characterized by two well-defined spectral peaks in ARPES due to coherent bilayer splitting and superlinear behavior in the resistivity, whereas the latter is characterized by a single broad spectral feature in ARPES and a linear temperature dependence of the resistivity.

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A. Kaminski, S. Rosenkranz, H. M. Fretwell, Z. Li, H. Raffy, M. Randeria, M. R. Norman, J. C. Campuzano. 2002-10-23. Crossover from coherent to incoherent electronic excitations in the normal state of Bi2Sr2CaCu2O8. https://doi.org/10.1103/physrevlett.90.207003

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