Title: Critical current densities of submillimeter single-grain TL-2223 superconducting thin film
Authors: Lin, HC
Juang, JY
Wu, KH
Gou, YS
Uen, TM
電子物理學系
光電工程學系
Department of Electrophysics
Department of Photonics
Keywords: high-T-c cuprate films;Tl-based compounds;reactive ion etching;critical current densities;vortex pinning
Issue Date: 15-Feb-1996
Abstract: Large single-crystalline superconducting grains of Tl2Ba2Ca2Cu3O10+x (Tl-2223) with sizes up to 150 mu m x 150 mu m x 1 mu m are obtained on both MgO(100) and LaAlO3 (100) substrates by a single-target de-sputtering process followed by appropriate postannealing at temperatures around 910 degrees C. Such superconducting grains were isolated and patterned into 10-mu m-wide bridges by reactive ion etching. The etching process was found to only minimally affect the transition temperature, T-c, typically around 110 K, of the films. Although there was evidence that these films were indeed two-dimensional in nature, the critical current densities, J(c), were greater than 10(6) A/cm(2) at temperatures below 90 K. At lower temperatures, e.g., T = 30 K, the J(c) value of these films remains well above 10(6) A/cm(2) even with magnetic fields as large as 7 T applied parallel to the c-axis of the grains. The results are in sharp contrast to the low J(c) values expected from the low-dimensionality nature of this system.
URI: http://dx.doi.org/10.1143/JJAP.35.L209
http://hdl.handle.net/11536/1451
ISSN: 0021-4922
DOI: 10.1143/JJAP.35.L209
Journal: JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS
Volume: 35
Issue: 2B
Begin Page: L209
End Page: L212
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