The effects of the post-annealing time on the growth mechanism of Bi2Sr2Ca1Cu2O8+∂ thin films produced on MgO (100) single crystal substrates by pulsed laser deposition (PLD)

Abstract

Bi 2 Sr 2 Ca 1 Cu 2 O 8 þ ∂ thin films were deposited on MgO (100) substrates by pulsed laser deposition (PLD). The effects of post-annealing time on the phase formation, the structural and superconducting properties of the films have been investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), temperature dependent resistivity (R-T), atomic force microscopy (AFM), and DC magnetization measurements. The films deposited at 600 1C were post-annealed in an atmosphere of a gas mixture of Ar (93%) and O 2 (7%), at 860 1C for 10, 30, and 60 min. All films have demonstrated a mainly single phase of 2212 with a high crystallinity (FWHM E 0.1591) and c-axis oriented. The critical temperature, T C , of the films annealed for 10, 30, and 60 min were obtained as 77, 78, and 78 K, respectively. The highest critical current density, J C , was calculated as 3.34 Â 10 7 A/cm 2 for the film annealed at 860 1C for 30 min at 10 K.

Microstructure and substrate dependent enhanced critical current density in Pb-substituted Bi-based high temperature superconducting thin films

“…SEM measurements were performed on the bulk and the thin film samples to get more insight into the JC value with the decrease in the dimensionality of the sample. Figures 3(a In the case of the thin films grown by the PLD technique, the values of J C obtained in the present study were found to be comparable to those reported in the literature [28][29][30][31]. The enhancement in the value of J C with the decrease in the dimensionality of the sample from bulk to thin-film can be related to the microstructure of the superconductor.…”

Superconducting properties and non-isothermal crystallization kinetics of a Bi2Sr2CaCu2O8+δ (Bi2212) superconductor prepared by the Pechini sol–gel method

“…Compared with the Bi2201 phase, both the Bi2212 and Bi2223 phases have a higher superconducting transition temperature (T c ), which can realize a breakthrough in high-temperature superconductors without rare earth elements above the liquid nitrogen temperature. 4,5 However, compared with the Bi2212 phase, the pure phase or single crystal of the Bi2223 phase with T c of 110 K is difficult to prepare, which makes the ne structure of the crystal difficult to determine. Consequently, the Bi2212 superconductor has been extensively studied due to its relatively easy preparation and stable crystal structure.…”

Materials Informatics Reveals Unexplored Structure Space in Cuprate Superconductors

“…From the results presented here, we believe that the 3D strain engineering of Bi2201 or Bi2212 systems are of particular interest because they lie at the base of the unexplored region with >2.5Å apical distances (Figure 3E). 3D strain engineering using VAN is suitable for Bi2201 and Bi2212 because they can be made in situ via epitaxial growth methods, [33,34] however, other methods such as nonlinear phononics might also be appropriate. [35] Such experiments would allow greater insight into whether the high Tcs of Hg and Tl based cuprates are due to structural effects from the large apical distance or intrinsic electronic effects of the Hg and Tl cations.…”