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T <sub>c</sub> -dependence of energy gap and asymmetry of coherence peaks in NdBa <sub>2</sub> Cu <sub>3</sub> O <sub>7-δ</sub> superconductors
We report here the results of scanning tunneling spectroscopy experiments performed on hole-doped NdBa2Cu3O7- δ single crystals of Tc values of 76 K, 93.5 K and 95.5 K. The energy gaps are observed to be increasing with decreasing Tc values. The coherence peaks are asymmetric with the peaks at the …