$T_c$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa$_2$Cu$_3$O$_{7-\delta}$

We report here the results of scanning tunneling spectroscopic experiments performed on hole doped NdBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$ single crystals of $T_{c}$ values of 76 K, 93.5 K and 95.5 K. The energy gaps are observed to be increasing with decreasing $T_{c}$ values. The coherence peaks are asymmetric with the peaks at the filled states being larger than those at the empty ones. The asymmetry increases with decreasing $T_{c}$ . The observed asymmetry and its $T_{c}$ dependence can be explained by considering the Mott insulating nature of the material at the undoped state.

$T_{c}$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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$T_{c}$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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TcTc​ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa22​Cu33​O7−δ7−δ​

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TcTc​ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa22​Cu33​O7−δ7−δ​

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$T_{c}$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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$T_{c}$ Dependence of Energy Gap and Asymmetry of Coherence Peaks in NdBa $_{2}$ Cu $_{3}$ O $_{7 - δ}$

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