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Microstructure and Superconductivity of Ultrathin YBa2Cu3O7-δ Films |
ZHENG Lizhen;SUN Jijun;ZHAO Bairu;XU Bo;LI Jinwei;YIN Bo,
WU Fei;JIA Shunlian;LI Lin;ZHAO Zhongxian;ZHU Chuanfeng;BAI Chunli
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National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, Beijing 100080
Institute of Chemistry, Academia Sinica, Beijing 100080 |
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Cite this article: |
ZHENG Lizhen, SUN Jijun, ZHAO Bairu et al 1995 Chin. Phys. Lett. 12 625-628 |
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Abstract Two unit cells to 200Å thick ultrathin YBa2Cu3O7-δ films have been synthesized and their growth mechanism and physical properties have been studied. Atomic force microscopy showed that the films grow with both spiral and layer by layer modes and the screw dislocations appeared even in the 6 unit cells thick films. In the initial growth stages of the films, the strong dependence of Tc on the film thickness is discussed.
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Keywords:
74.76.Bz
74.62.-c
68.55.-a
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Published: 01 October 1995
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PACS: |
74.76.Bz
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74.62.-c
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(Transition temperature variations, phase diagrams)
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68.55.-a
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(Thin film structure and morphology)
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Abstract
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