Title :
YBa2Cu3O7-δ thick films grown on textured metal substrates by liquid-phase epitaxy process
Author :
Maeda, T. ; Kim, Seung-bum ; Suga, Takashi ; Kurosaki, H. ; Yuasa, Takeshi ; Yamada, Y. ; Yamada, Y. ; Yoshino, Hideaki ; Yamazaki, M. ; Thanh, T.D. ; Watanabe, Toshio ; Matsumoto, Kaname ; Hirabayashi, I.
Author_Institution :
Supercond. Res. Lab., ISTEC, Nagoya, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
Towards high-current wire application of high-temperature superconductors, YBa2Cu3O7-δ (YBCO) thick films are grown by means of a liquid-phase epitaxy (LPE) process on a (001) surface of NiO single crystal and laser-sputtered NiO buffer layer deposited on a (001) surface of SrTiO3 single crystal. NiO buffer layers can be rapidly formed on textured Ni tape by the recently developed “surface-oxidation-epitaxy” (SOE) technique which is expected to be a low-cost production method of long metal substrates with highly-textured oxide buffer layer. LPE growth on SOE-buffered textured Ni tapes are also attempted. Moreover, we successfully prepared ~0.1 m-long LPE-YBCO tapes on {120}<21¯0> Ag-0.1 wt.% Cu alloy tape by using a specially designed LPE furnace equipped with a “reel-to-reel” attachment. BaF2-added BaO-CuO flux is used in this work, in which the growth temperature of YBCO is drastically lowered from the usually used value of ~1000°C down to 900-930°C. While current transport performances of these LPE-YBCO films are still insufficient for high-current wire application, the present results show the high potential of this LPE process for long-length coated-conductor production
Keywords :
barium compounds; high-temperature superconductors; liquid phase epitaxial growth; oxidation; superconducting tapes; superconducting thin films; surface texture; thick films; yttrium compounds; (001) surface; 900 to 930 degC; AgCu; BaF2-added BaO-CuO flux; LPE; Ni; NiO; SrTiO3; YBa2Cu3O7-δ; YBa2Cu3O7; current transport performance; growth temperature; high-current wire application; high-temperature superconductors; laser-sputtered buffer layer; liquid-phase epitaxy; long-length coated-conductor production; reel-to-reel≫CLOSE attachment; single crystal; surface-oxidation-epitaxy; textured Ni tape; textured metal substrate; thick films; {120}<21¯0> Ag-Cu dilute alloy tape; Buffer layers; Copper alloys; Epitaxial growth; High temperature superconductors; Production; Substrates; Surface emitting lasers; Thick films; Wire; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
