Oxygen doping and temperature dependence of the tunneling spectroscopy on Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00753844· OSTI ID:443629

Renner, C; Revaz, B; Genoud, J Y; Fischer, O ^[1]

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1. Univ. of Geneva (Switzerland)

The authors present local probe tunneling spectroscopy of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} single crystals for different oxygen concentrations, from optimally doped (T{sub c}=92.2 K) to highly overdoped (T{sub c}=56.0 K) phases. With increasing oxygen overdoping, the superconducting gap ({Delta}{sub p}) is reduced and the dip structure beyond {Delta}{sub p} at negative sample bias shifts toward the Fermi energy. Apart from the shift in energy of these features, the generic shape of the tunneling spectra remains unchanged. The gap roughly scales with T{sub c}, and 2{Delta}{sub p}/k{sub B}T{sub c} stays large even in the highly overdoped phase. The authors also present preliminary results on the temperature dependence of the tunneling spectra. They are consistent with a gap that is largely independent on temperature up to the vicinity of T{sub c}.

• Sponsoring Organization: USDOE
• OSTI ID: 443629
• Report Number(s): CONF-960808--
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 5-6 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BISMUTH OXIDES
CALCIUM OXIDES
COPPER OXIDES
CRYSTAL DOPING
ENERGY GAP
HIGH-TC SUPERCONDUCTORS
OXYGEN ADDITIONS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE