Speaker
Description
In this paper, BaZrO3 doped YBa2Cu3O7 (BZO/YBCO) nanocomposite films with 2-8 vol.% BZO doping were fabricated in a multilayer (ML) format by insertion of two 10 nm thick Ca0.3Y0.7Ba2Cu3O7-x spacer layers in BZO/YBCO nanocomposite. By measuring critical current density Jc in these ML samples, we aims to probe the effect of strain field overlap increased with BZO doping on the BZO/YBCO interface modification via ML scheme. Significant Jc enhancement was observed in ML films as compared to their SL counterpart’s, which results in overall higher pinning force density (Fp) while the enhancement is affected by the BZO doping quantitatively. At 65 K, the enhancement of peak Fp (or Fp,max) is 71%, 67%, 296%, and 47% for 2 vol.%, 4 vol.%, 6 vol.%, and 8 vol.% ML films respectively. In addition, the Bmax (the location of the Fp,max) is shifted towards higher values for BZO/YBCO ML films by up to 60%. This result illustrates the improved pinning efficiency of the BZO 1D-APCs in the BZO/YBCO ML films with a broad BZO doping range of 2-8 vol.% while the peak enhancement may be a compromise of the modulated strain field in facilitating preferential Ca ion diffusion along the BZO/YBCO interface for improved BZO/YBCO interface and hence pinning efficiency and other Ca ion diffusion into BZO/YBCO with primarily reduced the Tc values to impact pinning negatively.
| Talk Credit? | Yes |
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