Electronic interactions between graphene and cobaltite thin film La0.7Sr0.3CoO3 and its magnetic consequences
نویسندگان
چکیده
We have successfully synthesized and transferred graphene (Gr) monolayers on top of epitaxial mixed valence La0.7Sr0.3CoO3 (LSCO) thin films. Raman spectroscopy reveals that Jahn-Teller (JT) modes associated with the oxygen octahedral distortions usually unobserved for bare LSCO are activated by deposited graphene. The appearance these JT in Gr/LSCO heterostructure is attributed to electronic interactions at interface between film promoting intermediate spin states Co ions. As a result, magnetic properties affected. Indeed, magnetization measurements show phase transition ~135 K which due presence while ferromagnetic films observed at~200 K. This confirmed as function temperature revealing vibrational around same temperature.
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ژورنال
عنوان ژورنال: Surfaces and Interfaces
سال: 2021
ISSN: ['2468-0230']
DOI: https://doi.org/10.1016/j.surfin.2020.100919