Phys. Rev. Lett. 80, 157–160 (1998)Strong Dependence of the Superconducting Gap on Oxygen Doping from Tunneling Measurements on Bi2Sr2CaCu2O8-δReceived 20 August 1997; published in the issue dated 5 January 1998 Tunneling measurements are reported for break junctions on Bi2Sr2CaCu2O8-δ single crystals with various oxygen concentrations. Superconducting energy gaps Δ are observed in the underdoped samples which are considerably larger (∼30%) than found in optimal doped crystals. The trend of decreasing Δ and 2Δ/kTc with increasing hole doping is continued into the overdoped region. Thus the superconducting gap and strong-coupling ratio change monotonically and dramatically over a narrow doping region where Tc exhibits a maximum. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.157
DOI:
10.1103/PhysRevLett.80.157
PACS:
74.50.+r, 74.25.Dw, 74.62.Dh, 74.72.Hs
See AlsoComment: R. S. Markiewicz and C. Kusko, Comment on “Predominantly Superconducting Origin of Large Energy Gaps in Underdoped Bi2Sr2CaCu2O8+δ from Tunneling Spectroscopy”, Phys. Rev. Lett. 84, 5674 (2000). Reply: John Zasadzinski and Nobuaki Miyakawa, Zasadzinski and Miyakawa Reply:, Phys. Rev. Lett. 84, 5675 (2000). |
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