Pioneering measurements of the superfluid density in ultrathin films of a high-temperature superconductor demonstrate the importance of phase fluctuations for the physics of these fascinating materials.
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Franz, M. Importance of fluctuations. Nature Phys 3, 686–687 (2007). https://doi.org/10.1038/nphys739
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DOI: https://doi.org/10.1038/nphys739
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