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Optimization of BaHfO3 Doping Concentration as Secondary Phase in Y0.5Gd0.5Ba2Cu3O7−x Thin Film Prepared by Pulsed Laser Deposition

  • SaiDan Lu
  • LinFei Liu
  • Wei Wang
  • Xiang Wu
  • YanJie Yao
  • BingBing Wang
  • YiJie LiEmail author
Original Paper

Abstract

BaHfO3 (BHO)-doped Y0.5Gd0.5Ba2Cu3O7−x (YGBCO) films with a series of doping concentrations (1, 3, 5, and 10 mol%) were fabricated on CeO2 buffer layers by pulsed laser deposition (PLD) technique, and a pristine YGBCO film was also deposited at the same conditions for comparison. X-ray diffraction (XRD) results showed that the undoped and doped YGBCO films had a pure c-axis orientation. While the surface morphology and crystal quality of the BHO-doped YGBCO films deteriorated as the BHO content increased, and the critical current density (J c) at 77 K and self-field (\(J_{\mathrm {c}}^{77,0})\) and critical transition temperature (T c) of the BHO-doped YGBCO films exhibited varying degrees of decline in comparison with the pristine YGBCO film. However, the 5 mol% BHO-doped YGBCO film exhibited greatly enhanced the J c and the highest pinning force densities (F p) at both 4.2 and 65 K, which showed the maximum value of 5776 GN/m3 (4.2 K, H//c) and 117 GN/m3 (65 K, H//c), about 1.5 times that of the undoped YGBCO film. Based on the results, the 5 mol% BHO-doped YGBCO film had the most effective flux pinning centers, which are responsible for strongly improved critical current densities in magnetic fields.

Keywords

BHO YGBCO PLD Doping concentration 

Notes

Acknowledgements

This work was supported by the Natural Science Foundation of China (grant numbers 11204174 and 51372150) 863 project (grant number 2014AA032702) Shanghai Commission of Science and Technology (grant number 16521108302) and Ministry of Science and Technology of the People’s Republic of China ITER project (grant number 2011GB113004).

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • SaiDan Lu
    • 1
  • LinFei Liu
    • 1
  • Wei Wang
    • 1
  • Xiang Wu
    • 1
  • YanJie Yao
    • 1
  • BingBing Wang
    • 1
  • YiJie Li
    • 1
    Email author
  1. 1.Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and AstronomyShanghai Jiao Tong UniversityShanghaiChina

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