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将Tl2Ba2CaCu2O8(TBCCO)高温超导薄膜通过磁控溅射的方法沉积到LaAlO3(LAO)衬底上,SEM和XRD的测量结果显示该超导薄膜具有很高的成膜品质.通过标准四引线方法对TBCCO/LAO高温超导薄膜在不同磁场下的电阻转变进行了研究.结果表明:在一定的磁场下TBCCO/LAO超导薄膜具有很强的电阻转变展宽现象,并且当磁场垂直于超导薄膜表面时该超导薄膜显示出更强的电阻转变展宽现象.用热激活辅助磁通流动理论对该超导薄膜的电阻转变展宽现象进行了解释,同时通过分析超导薄膜的电阻转变对该超导薄膜的各向异性进行了讨论.
The high temperature superconducting thin films of Tl2Ba2CaCu2O8 (TBCCO) were deposited on LaAlO3 (LAO) substrate by magnetron sputtering.The results of SEM and XRD show that the superconducting thin films have high film quality.According to the standard four-lead method The resistance transformation of TBCCO / LAO high temperature superconducting thin films under different magnetic fields was studied. The results show that the TBCCO / LAO superconducting thin films have a strong resistive transition broadening phenomenon under a certain magnetic field, and when the magnetic field is perpendicular to the superconducting thin films The surface of the superconducting thin film shows a stronger resistance transition broadening phenomenon.The heat transfer assisted flux flow theory of the superconducting thin film resistance transition broadening phenomenon was explained at the same time by analyzing the superconducting thin film resistance transformation of the super The anisotropy of the film is discussed.