Ultrathin lead films below about 9 nm show a broad specific heat peak and no measurable jump at the superconducting transition, reported as the first thermodynamic BKT signature in a 2D superconductor.
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Specific Heat Signature of the Berezinskii-Kosterlitz-Thouless Transition in Ultrathin Superconducting Films
Ultrathin lead films below about 9 nm show a broad specific heat peak and no measurable jump at the superconducting transition, reported as the first thermodynamic BKT signature in a 2D superconductor.