Dependence of Upper Critical Field and Pairing Strength on Doping in Cuprates

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Science  03 Jan 2003:
Vol. 299, Issue 5603, pp. 86-89
DOI: 10.1126/science.1078422

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We have determined the upper critical fieldH c2 as a function of hole concentration in bismuth-based cuprates by measuring the voltage induced by vortex flow in a driving temperature gradient (the Nernst effect), in magnetic fields up to 45 tesla. We found that H c2decreased steeply as doping increased, in both single and bilayer cuprates. This relationship implies that the Cooper pairing potential displays a trend opposite to that of the superfluid density versus doping. The coherence length of the pairs ξ0 closely tracks the gap measured by photoemission. We discuss implications for understanding the doping dependence of the critical temperatureT c0.

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