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 λ1 (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.
|Original language||English (US)|
|Number of pages||3|
|State||Published - 1996|
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