Author: Sakata H. Katagiri A. Yokoi M. Kato T. Morimoto H.
Publisher: Springer Publishing Company
ISSN: 0022-2291
Source: Journal of Low Temperature Physics, Vol.131, Iss.3-4, 2003-05, pp. : 275-279
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Abstract
We have measured the tunneling spectra in Bi2Sr2CaCu2O8 with a scanning tunneling microscope(STM) at various tip-sample distances by changing the tunneling conductance in a controlled manner. When the tunneling conductance is increased from 1×10-9 to 1×10-5 S, the spectra do not show changes in particular. However, the gap value decreases steeply and the asymmetric back ground density of states turns inverted
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