A new method to preserve the c-axis growth of thick YBa2Cu3O7-delta films grown by pulsed laser deposition

作者：Zhu Dongliang; Huang Jie; Li Hui; Shen Mingrong; Su Xiaodong^*

来源：Physica C-Superconductivity and Its Applications, 2009, 469(22): 1977-1982.

DOI：10.1016/j.physc.2009.07.009

• YBCO film
• c-Axis growth
• PLD target

YBa2Cu3O7-delta (YBCO) films were prepared on (100) MgO substrates by pulsed laser deposition (PLD) method. In order to eliminate the a-axis growth, which is commonly observed in the YBCO film thicker than a critical value, we developed a new PLD target that was sintered at a temperature far below YBCO 123 phase formation. The surface analysis made by AFM technique confirmed that very fine particles of around 20 nm size could be ejected from the new target to the substrate. The fine oxide clusters could be easily moved and incorporated into the YBCO phase thus benefited the c-axis growth even in the thick films. For instance, only the c-axis growth in the new film with a thickness of about 650 nm was larger than a critical thickness of the a-axis growth. However, in the standard film of the same thickness, there is similar to 24.5% of the a-axis growth accompanying the main c-axis growth. Therefore, the c-axis growth could be preserved in the very thick YBCO film by a non-superconducting target.

• 出版日期2009-11-15
• 单位苏州大学