By using highly conductive -type (LSMO) and -type (LSSO) as electrodes, all-oxide (PZT) capacitors, LSMO/PZT/LSMO, LSSO/PZT/LSSO, LSSO/PZT/LSMO, and LSMO/PZT/LSSO, have been grown epitaxially on substrates, and their structure, switching, fatigue, and optical properties were investigated. Strikingly, contrary to the LSMO/PZT/LSMO capacitors, those having the -type electrode show poor fatigue resistance especially at lower driving frequencies, which was further confirmed by using another -type oxide electrode, . The results suggest that with a depletion layer at the PZT/LSSO interface, charge accumulation and injection during switching may be responsible for the fatigue.
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