Abstract
We have carried out low temperature scanning tunneling microscopy/spectroscopy (STM/STS) on YBa2Cu3Oy (YBCO) and succeeded in observing vortices and quasiparticle state inside the vortex core. In this paper, we present experimental details of STS measurement and its results. Samples are chemically etched with 1% Br-ethanol to achieve suitable surface condition for STS study. Observed vortices have differences in its shape but arranges in relatively ordered configuration. The spectra of the vortex core shows localized states at Vsample≃±5 mV which does not consistent with the core state in pure dx2−y2 order parameter.
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