Strain-induced Effects in Flexible Heteroepitaxy of Perovskite Manganites on Muscovite
Min Yen1*, Ying-Hao Chu1,2
1材料科學與工程學系, 國立交通大學, 新竹, Taiwan
2新世代功能性物質研究中心, 國立交通大學, 新竹, Taiwan
* Presenter:Min Yen,
Perovskite manganites, Re1-xAexMnO3 (Re is a trivalent rare-earth ion and Ae is divalent alkaline-earth ion), have been considered as the most promising materials for achieving the manipulation of electromagnetic properties and leading the creation of next-generation electronic devices. Due to the strong coupling between four degrees of freedom (spin, charge, orbital and strain), novel fascinating propeties such as colossal magnetoresistance (CMR), Curie temperature (Tc) and metal-insulator transition (MIT) have studied with the modification of strain via clamping effect from different hard substrates. However, the application of strain is not arbitrary which cause the lack of the comprehensive study of strain with other threes degrees of freedom. In this study, we choose muscovite as a flexible substrate and fabricate heteroepitaxial thin-film structure of perovskite manganites (La0.5Sr0.5MnO3, La0.5Ca0.5MnO3 and Pr0.5Ca0.5MnO3. By means of excellent flexibility of muscovite, elastic strain can be applied through bending and as a tunable parameter to systematically investigate MR, Tc and MIT with different strain. The enhancement of MR ratio and both the shifts of MIT and Tc are disclosed. The counterparts of thin film on rigid substrates are included to complete this research. Through this combination, we not only exhibit excellent magnetic and electrical properties with flexible characteristics but also pioneer a new field of strain-controlled electromagnetics based on muscovite.

Keywords: Perovskite manganites, muscovite, metal-insulator transition, magnetoresistance, Curie temperature