Studies of growth, microstructure, Raman spectroscopy and annealing effect of pulsed laser deposited Ca-doped NBCO thin films

Abstract

Superconducting thin films of Nd1−xCaxBa2Cu3O7−δ (x = 0.03 and 0.08) have been grown on single crystal SrTiO3 substrates by pulsed laser deposition. The statistical methods of Experimental Design and regression analysis were used to optimize the film properties and to understand the correlation between the growth parameters and film properties. The orientation of the films was investigated by x-ray diffraction. The surface morphology of the films was examined by atomic force microscopy and scanning tunnelling microscopy. Qualitative and quantitative elemental analyses of the films were carried out using electron probe microanalysis. Micro-Raman spectroscopy was used to study the oxygen sublattice vibrations of the films. The effect of annealing on the superconducting transition temperature of the patterned films was also studied.

Growth, microstructure, Raman spectroscopy and annealing effect of Nd1−xYxBa2Cu3O7−δthin films by laser ablation

“…The present investigation was focused on a frequency range where the modes correspond to oxygen sublattice vibrations. The orthorhombic unit cell of superconducting NdBa 2 Cu 3 O 7 with the oxygen atoms labelled can be found in [21].…”

Structural study of epitaxial NdBa2Cu3O7−x films by laser chemical vapor deposition

“…7 Therefore, c-axisoriented and well ab-aligned NdBCO lm possesses highranking superconducting properties. As a matter of fact, caxis-oriented epitaxial growth of NdBCO lms has been studied under the cases of various fabrication techniques, including metal organic chemical vapor deposition (MOCVD), 8,9 pulsed laser deposition (PLD), 10,11 magnetron sputtering. [12][13][14] These studies supposed that the deposition temperature (T dep ) was the key factor affecting the growth orientation, and as the lm thickness increased, the strain relaxation in the lm would also have a certain effect on the growth orientation.…”