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In this thesis, we mainly discuss the relationships between the
single electron tunneling currents and tunneling voltages of
YBCO high temperature superconducting thin films with various
oxygen contents by a scanning tunneling microscope(STM). YBCO
films were fabricated on several substrates by pulse laser
deposition(PLD) method. Their oxygen contents were controlled
with a homemade system. The tunneling currents I and tunneling
voltages V were measured with the STM. The tunneling currents
were then differentiated with respect to the voltages and the
resulting dI/dV-V curves were used to calculate the
superconducting energy gaps.
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