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- Title
High-transition-temperature superconductivity in the absence of the magnetic-resonance mode.
- Authors
Hwang, J.; Timusk, T.; Gu, G. D.
- Abstract
The fundamental mechanism that gives rise to high-transition-temperature (high-Tc) superconductivity in the copper oxide materials has been debated since the discovery of the phenomenon. Recent work has focused on a sharp ‘kink’ in the kinetic energy spectra of the electrons as a possible signature of the force that creates the superconducting state. The kink has been related to a magnetic resonance and also to phonons. Here we report that infrared spectra of Bi2Sr2CaCu2O8+d (Bi-2212), shows that this sharp feature can be separated from a broad background and, interestingly, weakens with doping before disappearing completely at a critical doping level of 0.23 holes per copper atom. Superconductivity is still strong in terms of the transition temperature at this doping (Tc ˜ 55?K), so our results rule out both the magnetic resonance peak and phonons as the principal cause of high-Tc superconductivity. The broad background, on the other hand, is a universal property of the copper-oxygen plane and provides a good candidate signature of the ‘glue’ that binds the electrons.
- Subjects
HIGH temperature superconductivity; SUPERCONDUCTIVITY; MAGNETIC resonance; COPPER oxide superconductors; STOPPING power (Nuclear physics); PHONONS
- Publication
Nature, 2004, Vol 427, Issue 6976, p714
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/nature02347