Title :
Nd-doped YBa2Cu3O7-x films deposited by pulsed laser ablation
Author :
Varanasi, Chakrapani V. ; Tolliver, J.C. ; Haugan, T.J. ; Sathiraju, Srinivas ; Maartense, I. ; Barnes, P.N.
Author_Institution :
Univ. of Dayton Res. Inst., OH, USA
fDate :
6/1/2005 12:00:00 AM
Abstract :
Nd doped YBa2Cu3O7-x targets (NdxY1-xBa2Cu3O7-x; x=0, 0.2, 0.4, 1) were prepared in-house and were used to deposit films by pulsed laser ablation in 300 mTorr of oxygen to study the Nd substitution effects on the film properties. Film composition was found to match very closely to the composition of the targets as determined from X-ray photoelectron spectroscopy. The critical transition temperature (Tc) was found to be reduced as the Nd substitutions were increased in the films. Raman spectra taken from the films indicate that c-axis misalignment and some cation disorder may be present in the films with poor Tc. Transport critical current density (Jc) of 3×106 A/cm2 was measured in Nd0.4Y0.6Ba2Cu3O7-x films.
Keywords :
Raman spectra; critical current density (superconductivity); doping; high-temperature superconductors; pulsed laser deposition; thin films; Nd; Nd-doped films; Raman spectra; X-ray photoelec-tron spectroscopy; c-axis misalignment; cation disorder; coated conductors; critical transition temperature; film composition; film properties; pulsed laser ablation; rare earth pinning; transport critical current density; Critical current density; Density measurement; Laser ablation; Laser transitions; Neodymium; Optical pulses; Pulsed laser deposition; Spectroscopy; Temperature; X-ray lasers; Coated conductors; Nd substitutions; YBCO; pulsed laser ablation; rare earth pinning;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2005.849414
