Phys. Rev. Lett. 85, 4787–4790 (2000)Discriminating the Superconducting Gap from the Pseudogap in Bi2Sr2CaCu2O8+δ by Interlayer Tunneling SpectroscopyReceived 10 March 2000; published in the issue dated 27 November 2000 Tunneling spectroscopy using a very thin stack of intrinsic Josephson junctions has revealed that the superconducting gap is definitely different from the pseudogap in the Bi2Sr2CaCu2O8+δ system. In the underdoped region, the conductance peak arising from the superconducting gap is independently observed in the dI/dV-V curve and its position is much lower than that of the pseudogap. Near the optimum doping level and in the overdoped region, both peaks are located in close proximity. These findings are in conflict with a previous understanding of the pseudogap. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.4787
DOI:
10.1103/PhysRevLett.85.4787
PACS:
74.72.Hs, 74.50.+r, 74.25.Jb
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