Title :
Fabrication and characterization of high quality NdBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///Sr/sub 2/AlTaO/sub 6//NdBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// and NdBa/sub 2/Cu/sub 3/O/sub 7-/spl delta///Sr/sub 2/AlNbO/sub 6//NdBa/sub 2/Cu/sub 3/O/sub 7-/spl de
Author :
Yijie Li ; Saba, F.M. ; Wen, J.G. ; Tanabe, Kazuki
Author_Institution :
Superconductivity Res. Lab., Int. Superconductivity Technol. Center, Tokyo, Japan
fDate :
6/1/1999 12:00:00 AM
Abstract :
High quality epitaxial Sr/sub 2/AlTaO/sub 6/ (SAT) and Sr/sub 2/AlNbO/sub 6/ (SAN) insulator films as well as the related trilayers of NdBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (NBCO)/SAT/NBCO and NBCO/SAN/NBCO have been successfully grown on SrTiO/sub 3/ [100], LaAlO/sub 3/ [100], and YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta//(YBCO) [001] single crystal substrates by pulsed laser deposition (PLD). The top and bottom NBCO layers have a T/sub c/0 of 87-90 K and J/sub c/>10/sup 6/ A/cm/sup 2/ at 77 K, measured by four-probe and dc magnetization methods. X-ray diffraction and transmission electron microscopy analyses reveal that the deposited trilayers have an all-epitaxial structure and abrupt interface without interdiffusion. We also measured the dielectric properties of SAT layers using the patterned structures on YBCO [001] single crystal substrates. Our results show that SAT and SAN can be used as insulator layers on YBCO single crystal substrate in high-T/sub c/ superconducting multilayer processing including NBCO films.
Keywords :
Josephson effect; aluminium compounds; barium compounds; high-temperature superconductors; neodymium compounds; pulsed laser deposition; strontium compounds; superconducting epitaxial layers; DC magnetization; Josephson junction; LaAlO/sub 3/ [100] substrate; NBCO/SAN/NBCO trilayer; NBCO/SAT/NBCO trilayer; NdBa/sub 2/Cu/sub 3/O/sub 7/-Sr/sub 2/AlNbO/sub 6/-NdBa/sub 2/Cu/sub 3/O/sub 7/; NdBa/sub 2/Cu/sub 3/O/sub 7/-Sr/sub 2/AlTaO/sub 6/-NdBa/sub 2/Cu/sub 3/O/sub 7/; SrTiO/sub 3/ [100] substrate; X-ray diffraction; YBCO [001] single crystal substrate; dielectric properties; epitaxial insulator film; fabrication; four-probe resistivity; high-T/sub c/ superconducting multilayer; pulsed laser deposition; transmission electron microscopy; Dielectric measurements; Dielectric substrates; Fabrication; Insulation; Optical pulses; Pulsed laser deposition; Storage area networks; Strontium; Superconducting films; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
