Strong Dependence of the Superconducting Gap on Oxygen Doping from Tunneling Measurements on Bi{sub 2} Sr{sub 2} CaCu{sub 2} O{sub 8{minus}{ital {delta} }}

Journal Article · Wed Dec 31 23:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.80.157· OSTI ID:573837

Miyakawa, N; Guptasarma, P; Zasadzinski, J F; Hinks, D G; Gray, K E ^[1]; Miyakawa, N ^[2]; Zasadzinski, J F ^[3]

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1. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
2. Department of Applied Physics, Science University of Tokyo, Kagurazaka 1-3, Shinjuku-ku, Tokyo, 162 (Japan)
3. Illinois Institute of Technology, Chicago, Illinois 60616 (United States)

Tunneling measurements are reported for break junctions on Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8{minus}{delta}} single crystals with various oxygen concentrations. Superconducting energy gaps {Delta} are observed in the underdoped samples which are considerably larger ({approximately}30{percent}) than found in optimal doped crystals. The trend of decreasing {Delta} and 2{Delta}/kT{sub c} 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 T{sub c} exhibits a maximum. {copyright} {ital 1997} {ital The American Physical Society}

• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 573837
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
DOPED MATERIALS
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
OXYGEN
STRONTIUM OXIDES
SUPERCONDUCTING JUNCTIONS
TUNNEL EFFECT