Tuning the interlayer spacing in high Tc superconductors: penetration depth and two-dimensional superfluid density
Abstract
Substantial control of the interlayer spacing in Bi-based high temperature superconductors has been achieved through the intercalation of guest molecules between the superconducting layers. Measurements using implanted muons reveal that the penetration depth increases with increasing layer separation while Tc does not vary appreciably, demonstrating that the bulk superfluid density is not the determining factor controlling Tc. Our results strongly suggest that the superfluid density appearing in the Uemura scaling relation ns/m* Tc should be interpreted as the two dimensional density within the superconducting layers, which we find to be constant for each class of system investigated.
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