期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 108, 期 23, 页码 9346-9349出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1101008108
关键词
cuprates; photoelectron spectroscopy
资金
- National Science Foundation [DMR-0606255, DMR-0706203]
- Synchrotron Radiation Center, University of Wisconsin [DMR-0537588]
- US Department of Energy, Office of Science laboratory [DE-AC02-06CH11357]
- UChicago Argonne, LLC, Operator of Argonne National Laboratory
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 Bi2Sr2CaCu2O8+delta using angle-resolved photo-emission. 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.
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