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Surface Topography and Tunneling Spectroscopy in High-Temperature Superconducting Thin Films by Scanning Tunneling Microscopy
並列摘要
The surface morphology and tunneling spectroscopies of the YBa2Cu3O7-x (YBCO) and TIBa2Ca2Cu3O9+x, (Tl-1223) high-T, superconducting thin films deposited on LaAlO3(100) substrates uere investigated by scanning tunneling microscopy (STM). The preliminary results show that although both systems have a common layer-like surface structure, the grain morphologies are quite different suggesting that they may follow different growth mechanisms probably due to the different preparation methods used. In addition, the tunneling current-voltage characteristics (IVCs) maniiested features akin to that of charging effect-induced single electron tunneling in both systems. As a result, the gap-like structure observed in the dI/dv-v curves may no: be reflecting the superconducting energy gaps as commonly conceived.
並列關鍵字
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延伸閱讀
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