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The superconductivity and pinning properties of Y2O3-doped GdBa2Cu3O7-δ films prepared by pulsed laser deposition

  • Oh, Won-Jae (Department of Materials Science & Engineering, and Research Institute of Advanced materials (RIAM), Seoul National University) ;
  • Park, Insung (Department of Materials Science & Engineering, and Research Institute of Advanced materials (RIAM), Seoul National University) ;
  • Yoo, Sang-Im (Department of Materials Science & Engineering, and Research Institute of Advanced materials (RIAM), Seoul National University)
  • Received : 2018.12.17
  • Accepted : 2018.12.30
  • Published : 2018.12.31

Abstract

We have investigated the effect of $Y_2O_3$ nanoparticles on the pinning properties of $Y_2O_3$-doped $GdBa_2Cu_3O_{7-{\delta}}$ (GdBCO) films. Both undoped and $Y_2O_3$-doped GdBCO films were grown on $CeO_2$-buffered MgO (100) single crystal substrates by pulsed laser deposition (PLD) using KrF (${\lambda}=248nm$) laser. The $Y_2O_3$ doping contents were controlled up to ~ 2.5 area% by varying the internal angles of $Y_2O_3$ sectors put on the top surface of GdBCO target. Compared with the $Gd_2O_3$-doped GdBCO films previously reported by our group [1], the $Y_2O_3$-doped GdBCO films exhibited less severe critical temperature ($T_c$) drop and thus slightly enhanced critical current densities ($J_c$) and pinning force densities ($F_p$) at 65 K for the applied field parallel to the c-axis of the GdBCO matrix (B//c) with increasing the doping content. Below 40 K, the in-field $J_c$ and $F_p$ values of all $Y_2O_3$-doped GdBCO films exhibited higher than those of undoped GdBCO film, suggesting that $Y_2O_3$ inclusions might act as effective pinning centers.

Keywords

TABLE I TC,ZERO , Δ TC , FWHM VALUES OF (005) REFLECTIONS, AND MAGNETIC JC VALUES OF SAMPLES.

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Fig. 3. Field dependence of magnetic Jc for undoped and Y2O3-doped GdBCO films at (a) 77, (b) 65, (c) 40, and (d) 20 K.

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Fig. 4. The pinning force density (Fp) versus applied field for undoped and Y2O3-doped GdBCO films at (a) 77, (b) 65, (c) 40, and (d) 20 K.

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Fig. 1. (a) Theta-2theta scans and (b) the peak of (005) reflection of undoped and Y2O3-doped GdBCO films.

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Fig. 2. The Tc,zero values (a) and normalized Tc values (b) with increasing Y2O3 and Gd2O3 doping contents for all GdBCO samples. (close circles for the Gd2O3-doped GdBCO films from ref. [1], open circles for the Y2O3-doped GdBCO films)

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