Abstract
Superlattices and trilayers consisting of three isostructured 123-type oxide superconductors, $\mathrm{Gd}123∕\mathrm{Nd}123∕\mathrm{Eu}123$, were prepared on $(100)$ ${\mathrm{SrTiO}}_{3}$ using off-axis pulsed laser deposition. Superconducting transition temperatures $({T}_{c})$ in the superlattices reduce monotonically with decreasing constituent thickness $(d)$, while ${T}_{c}$ and transport critical current density $({J}_{c})$ of the trilayers show no such suppression, being as good as in pure 123 thin films. Individual flux pinning and collective thermal-activated flux motion characterized by $\mathrm{log}\phantom{\rule{0.3em}{0ex}}{J}_{c}$ vs $\mathrm{log}\phantom{\rule{0.3em}{0ex}}H$ reveal flux pinning crossovers with field, temperature and layer thickness. Epitaxial-strain-induced thickness effects and correlated defects are applicable to account for the suppressed ${T}_{c}$ and flux pinning crossover in the present superlattices.
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