Abstract
Electron tunneling study on YBa 2Cu 3O y was carried out for investigation of an essential superconducting gap structure. Besides usual NIS junction, a kind of micro-break SIS junction was prepared in-situ on a low-temperature scanning tunneling microscope/spectroscope (LT-STM/STS) stage in order to minimize the influence of the surface-degradation. As the result, the observed tunneling spectra showed finite superconducting gap structure with extremely low and flat in-gap density of states, which indicates a quite different character from the gapless one expected by the d-wave pairing theory.
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