2011/05/23 by U.K. Chatterjee, U. Chatterjee, J. Zhao +15 · 77 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Coherence (philosophical gambling strategy) #Condensed matter physics #Copper #Copper oxide #Cuprate #Doping #Electronic structure #High-temperature superconductivity #Iron-based superconductors research #Materials science #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Pseudogap #Quantum mechanics #Superconductivity #cond-mat.supr-con
paper · pdf · doi:10.1073/pnas.1101008108
published in Proceedings of the National Academy of Sciences 108(23), 9346-9349 (National Academy of Sciences) · 5 pages, 4 figures. Published in Proc. Nat. Acad. Sci. vol. 108 pp 9346 (2011). Free to download
openalex publication_date 2011/05/23 · arxiv created 2013/02/13 · arxiv updated 2013/02/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
In order to understand the origin of high-temperature superconductivity in copper oxides, we must understand the normal state from which it emerges. Here, we examine the evolution of the normal state electronic excitations with temperature and carrier concentration in Bi(2)Sr(2)CaCu(2)O(8+δ) using angle-resolved photoemission. In contrast to conventional superconductors, where there is a single temperature scale T(c) separating the normal from the superconducting state, the high-temperature superconductors exhibit two additional temperature scales. One is the pseudogap scale T(∗), below which electronic excitations exhibit an energy gap. The second is the coherence scale T(coh), below which sharp spectral features appear due to increased lifetime of the excitations. We find that T(∗) and T(coh) are strongly doping dependent and cross each other near optimal doping. Thus the highest superconducting T(c) emerges from an unusual normal state that is characterized by coherent excitations with an energy gap.