Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Effect of double pinning mechanism in BSO-added GdBa2Cu3O7-x thin films

  • Oh, J.Y. (Department of Physics, Chungbuk National University) ;
  • Jeon, H.K. (Department of Physics, Chungbuk National University) ;
  • Lee, J.M. (Department of Physics, Sungkyunkwan University) ;
  • Kang, W.N. (Department of Physics, Sungkyunkwan University) ;
  • Kang, B. (Department of Physics, Chungbuk National University)
  • Received : 2017.07.07
  • Accepted : 2017.09.14
  • Published : 2017.09.30
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Abstract

We investigated the effect of self-assembled BSO nano-defects as pinning centers in BSO-added GdBCO films when the thicknesses of films were varied. 3.5 vol. % BSO-added GdBCO films with varying thicknesses from 200 nm to 1000 nm were deposited on $SrTiO_3$ (STO) substrate by using pulsed laser deposition (PLD) process. For the films with thicknesses of 400 nm and 600 nm, 'anomaly shoulders' in $J_c-H$ characteristic curves were observed near the matching field. The anomaly shoulders appeared in the field dependence of $J_c$ may be attributed to the existence of double pinning mechanisms in thin films. The fit to the pinning force density as a function of reduced field h ($H/H_{irr}$) using the Dew-Hughes' scaling law shows that both the 400 nm- and the 600 nm-thick films have double pinning mechanisms while the other films have a single pinning mechanism. These results indicate that the self-assembled property of BSO result in different role as pinning centers with different thickness.

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References

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