Abstract
Epitaxial Fe-substituted YBa2Cu3O7 films on LaAlO3 substrates prepared by pulsed-laser deposition exhibit a large variation in Tc with changes in the cooldown rate of the films in an O2 environment immediately after deposition. A rapid cooldown rate (200 °C/min) yields surprisingly high-Tc films with Tc≳75 K for 13% of the Cu replaced by Fe, while a slow cooldown of 10 °C/min results in low-Tc films with Tc→0 at 11% Fe, a greater suppression than reported for bulk materials. In addition, post-deposition anneals in O2 affect Tc significantly, even for anneal temperatures as low as 370 °C. These results are interpreted in terms of isolated- and clustered-Fe atoms substituted on the Cu chains sites.
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