Abstract
We present local probe tunneling spectroscopy of Bi2Sr2CaCu2O8+δ single crystals for different oxygen concentrations, from optimally doped (Tc=92.2 K) to highly overdoped (Tc=56.0 K) phases. With increasing oxygen overdoping, the superconducting gap (Δp) is reduced and the dip structure beyond Δp at negative sample bias1 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 Tc, and 2Δp/kBTc stays large even in the highly overdoped phase. We 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 Tc
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Ch. Renner and Ø. Fischer,Phys. Rev. B 51, 9208 (1995).
D.B. Mitzi et al.,Phys. Rev. B 41, 6564 (1990).
B.Revaz et al., (unpublished).
J.-Y. Genoud et al.,Rev. Sci. Instrum. 65, 3829 (1994).
Ch. Renner et al.,J. Vac. Sci. Technol. A8, 330 (1990); and A.D. Kent et al.,Ultramicroscopy 42–44, 1632 (1992).
Ch. Renner et al,Physica B 194–196, 1689 (1994); andPhysica C 235–240, 53 (1994).
Ch. Renner and Ø. Fischer,Proc. SPIE 2158, 135 (1994).
J. Liu, Y. Li, and C. Lieber,Phys. Rev. B 49, 6234 (1994).
D. Mandrus et al.,Nature 351, 460, (1991); andEurophys. Lett. 22, 199 (1993).
J.M. Valles, Jr, et al.,Phys. Rev. B 44, 11986 (1991).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Renner, C., Revaz, B., Genoud, J.Y. et al. Oxygen doping and temperature dependence of the tunneling spectroscopy on Bi2Sr2CaCu2O8+δ . J Low Temp Phys 105, 1083–1089 (1996). https://doi.org/10.1007/BF00753844
Issue Date:
DOI: https://doi.org/10.1007/BF00753844