Abstract
REBa2Cu4O8 superconductor has an important advantage that the critical temperature (Tc) is improved by Ca substitution for RE site. We fabricated the YBa2Cu4O8 (Y124) and Y0.9Ca0.1Ba2Cu4O8 (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
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