Abstract
In order to clarify the electron-hole symmetry in cuprates, Nd2−xCe x CuO4 (NCCO) thin films were fabricated for various Ce concentrations and conductance spectra were measured by tunneling spectroscopy. Since the superconductivity appears even at x=0.095, thin film samples have an advantage over single crystals for studying the electronic states in underdoped region. It is shown that the amplitude of superconducting energy gap was almost 7–11 meV in the whole superconducting range. Comparing with hole-doped cases, the energy gap of NCCO is relatively insensitive to the doping concentration.
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