Title :
Effect of substrate-twin-induced microstructure on transport properties of epitaxial Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub x/ films in a magnetic field
Author :
Kim, D.H. ; Miller, D.J. ; Hettinger, J.D. ; Gray, K.E. ; Landis, P.G. ; Sharping, J.E. ; Eddy, M.
Author_Institution :
Argonne Nat. Lab., IL, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The role of substrate-induced microstructure on transport properties in c-axis-oriented epitaxial Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub x/ films grown on LaAlO/sub 3/ and SrTiO/sub 3/ has been studied. For a magnetic field parallel to the Cu-O planes, resistivity and the critical current density, J/sub c/, have been measured as a function of angle theta between the applied field and the direction of transport current. Resistivity dips and enhancement of J/sub c/ were observed for magnetic fields applied parallel to the substrate twins in LaAlO/sub 3/ in high fields (>or=2 T). For films on SrTiO/sub 3/, resistivity and J/sub c/ were Lorentz-force independent.<>
Keywords :
barium compounds; calcium compounds; critical current density (superconductivity); crystal microstructure; electrical conductivity of crystalline semiconductors and insulators; high-temperature superconductors; superconducting epitaxial layers; thallium compounds; LaAlO/sub 3/; SrTiO/sub 3/; Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub x/; c-axis-oriented; critical current density; epitaxial films; high temperature superconductors; resistivity; substrate-twin-induced microstructure; Conductivity; Critical current density; High temperature superconductors; Magnetic field measurement; Magnetic fields; Magnetic films; Microstructure; Substrates; Superconducting epitaxial layers; Superconducting films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
