Jaeger, H. M., Haviland, D. B., Goldman, A. M. & Orr, B. G. Threshold for superconductivity in ultrathin amorphous gallium films. Phys. Rev. B 34, 4920–4923. https://doi.org/10.1103/PhysRevB.34.4920 (1986).
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Anomalous metallic state underdoped infinite-layer nickelate superconducting thin films
