期刊
SCIENCE
卷 335, 期 6076, 页码 1600-1603出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1216765
关键词
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资金
- Universita Cattolica del Sacro Cuore [D2.2 2010]
- Italian Ministry of University and Research [FIRBRBAP045JF2, FIRB-RBAP06AWK3]
- Swiss National Science Foundation [200020-130052]
- U.S. Department of Energy [DE-AC03-76SF00515]
- Killam
- Sloan Foundation
- Canada Research Chair Programs
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Canada Foundation for Innovation (CFI)
- NSERC
- Canadian Institute for Advanced Research (CIFAR)
- British Columbia Synchrotron Institute (BCSI)
- Swiss National Science Foundation (SNF) [200020_130052] Funding Source: Swiss National Science Foundation (SNF)
Unveiling the nature of the bosonic excitations that mediate the formation of Cooper pairs is a key issue for understanding unconventional superconductivity. A fundamental step toward this goal would be to identify the relative weight of the electronic and phononic contributions to the overall frequency (Omega)-dependent bosonic function, Pi(Omega). We performed optical spectroscopy on Bi2Sr2Ca0.92Y0.08Cu2O8+delta crystals with simultaneous time and frequency resolution; this technique allowed us to disentangle the electronic and phononic contributions by their different temporal evolution. The spectral distribution of the electronic excitations and the strength of their interaction with fermionic quasiparticles fully account for the high critical temperature of the superconducting phase transition.
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