Interlayer Tunneling Models of Cuprate Superconductivity: Implications of a Recent Experiment

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Science  25 Oct 1996:
Vol. 274, Issue 5287, pp. 587-589
DOI: 10.1126/science.274.5287.587


It is shown that, given a few generic assumptions, any theory of high-temperature superconductivity that attributes a substantial fraction of the condensation energy to the saving of c-axis kinetic energy must predict an inequality relating the c-axis penetration depth λ(0) to the zero-temperature superconducting-normal energy difference and the fluctuations of the c-axis kinetic energy around its mean value. Application of this formula to Tl2Ba2CuO6 implies that if λ(0) is greater than 10 micrometers, as suggested by a recent experiment, these fluctuations must have an unusual form.