Acta Physica Sinica, Volume. 69, Issue 7, 077401-1(2020)
YBa2Cu3O7-δ (YBCO) high temperature superconductor materials have many promising applications in energy, transportation and so on. Nonetheless, the application of YBCO in high magnetic field was limited because of low critical current. One-dimensional latent tracks produced by swift heavy ions irradiation can be effective pinning centers, thus enhancing superconductivity in external field. YBCO high temperature superconducting films were irradiated with 1.9 GeV Ta ions at room temperature and vacuum condition. Structure damages in irradiated samples were characterized by transmission electron microscopy (TEM). Continuous amorphous latent tracks, with diameter from 5 nm to 15 nm, throughout the whole superconducting layer can be observed from TEM images. Physical property measurement system (PPMS) was used to measure superconducting properties of samples before and after irradiation. When irradiated at optimal fluence of 8 × 1010 ions/cm2, critical current reaches its maximum value and pinning force was twice of unirradiated sample, while critical temperature almost unchanged. The analysis of experimental results shows that latent tracks produced by swift heavy ions irradiation can enhance in-field current-carrying capability, without decreasing critical temperature. In the power-law regime
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Li Liu, Jie Liu, Jian Zeng, Peng-Fei Zhai, Sheng-Xia Zhang, Li-Jun Xu, Pei-Pei Hu, Zong-Zhen Li, Wen-Si Ai.
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Received: Dec. 17, 2019
Accepted: --
Published Online: Nov. 20, 2020
The Author Email: Liu Jie (j.liu@impcas.ac.cn)