S Hüfner et al 2008 Rep. Prog. Phys. 71 062501 doi:10.1088/0034-4885/71/6/062501
Two gaps make a high-temperature superconductor?
REVIEW ARTICLES Hüfner1,2, M A Hossain1,2, A Damascelli1,2 and G A Sawatzky1,2
Show affiliationsOne of the keys to the high-temperature superconductivity puzzle is the identification of the energy scales associated with the emergence of a coherent condensate of superconducting electron pairs. These might provide a measure of the pairing strength and of the coherence of the superfluid, and ultimately reveal the nature of the elusive pairing mechanism in the superconducting cuprates. To this end, a great deal of effort has been devoted to investigating the connection between the superconducting transition temperature Tc and the normal-state pseudogap crossover temperature T*. Here we present a review of a large body of experimental data which suggests a coexisting two-gap scenario, i.e. superconducting gap and pseudogap, over the whole superconducting dome. We focus on spectroscopic data from cuprate systems characterized by 
, such as Bi2Sr2CaCu2O8+δ, YBa2Cu3O7−δ, Tl2Ba2CuO6+δ and HgBa2CuO4+δ, with particular emphasis on the Bi-compound which has been the most extensively studied with single-particle spectroscopies.
- PACS
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74.62.Dh Effects of crystal defects, doping and substitution
- Subjects
- Dates
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Issue 6 (June 2008)
Received 27 February 2008, in final form 2 April 2008
Published 2 May 2008
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Two gaps make a high-temperature superconductor?
S Hüfner et al 2008 Rep. Prog. Phys. 71 062501
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