Abstract
Epitaxial La0.7Ca0.3MnO3 (LCMO) films of 15–150nm thick have been grown on SrTiO3(001) [STO(001)] and (LaAlO3)0.3(Sr2AlTaO6)0.7(001) [LSAT(001)] substrates with lattice mismatches of 1.11% and 0.15%, respectively. Asymmetric x-ray reciprocal space mapping was used to determine the strain state evolution in the films. For LCMO/STO(001), as the film thickness increases, at about 30nm a change from fully to partially strained has been induced, and a further annealing at 900°C can fully relax the films. For LCMO/LSAT(001), however, due to the negligible lattice mismatch, even at 15nm the films are almost fully relaxed. Correspondingly, for the fully relaxed LCMO films a paramagnetic to ferromagnetic transition at TC of about 260K was observed, and for those partially relaxed, both the structure and magnetic transition are inhomogeneous, two thickness-dependent TC were detected for each film. The results show strong evidence that the transition temperature is correlated with the strain state in epitaxial LCMO films.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
