Predominantly Superconducting Origin of Large Energy Gaps in Underdoped Bi{sub 2} Sr{sub 2} CaCu{sub 2 }O{sub 8+ {delta}} from Tunneling Spectroscopy
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
- Department of Applied Physics, Science University of Tokyo, Kagurazaka 1-3, Shinjuku-ku, Tokyo 162-8601 (Japan)
- Illinois Institute of Technology, Chicago, Illinois 60616 (United States)
- Department of Physics, Izmir Institute of Technology, TR-35230 Izmir (Turkey)
- Naval Research Laboratory, Washington, D.C. 20375 (United States)
New tunneling data are reported in Bi{sub 2}Sr {sub 2}CaCu{sub 2}O{sub 8+{delta}} which show quasiparticle excitation gaps, {Delta}, reaching values as high as 60thinspthinspmeV for underdoped crystals with T{sub c}=70 K . These energy gaps are nearly 3thinspthinsptimes larger than those of overdoped crystals with similar T{sub c} . Despite the large differences in gap magnitude, the tunneling spectra display qualitatively similar characteristics over the entire doping range. Detailed examination of the spectra, including the Josephson I{sub c}R{sub n} product measured in break junctions, indicates that these energy gaps are predominantly of superconducting origin. {copyright} {ital 1999} {ital The American Physical Society}
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 361605
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 83; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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