Crystallinity and in-field characterization of high-Tc YBa 2Cu408 and Y0.9Ca 0.1Ba2Cu4O8 epitaxial films fabricated by low temperature flux method

Abstract

REBa2Cu4O8 superconductor has an important advantage that the critical temperature (Tc) is improved by Ca substitution for RE site. We fabricated the YBa2Cu4O 8 (Y124) and Y0.9Ca0.1Ba2Cu 4O8 (YCa124) films by molten hydroxide method in ambient atmosphere and investigated the crystallinity and in-field characterization. Obtained samples show that the film alignment is biaxial orientation and the grain size is larger than 50 μm, and the irreversibility field of YCa124 film is superior to that of Y124 in all the measured magnetic fields © Published under licence by IOP Publishing Ltd.