Abstract
The microstrains in heavy-ion irradiated manganite LaMnO3 can be managed in linear response of irradiation dose, and the corresponding internal pressure up to 8 GPa can be induced by varying doses. The response of structure under stress is studied by means of Density Functional Theory and Lattice Dynamic Calculation. All obtained Raman scattering lines are discussed in details to shed light onto structural changes during ion implantation. There appears new resonance peak at around 550 cm−1, which splits from broad features in the spectra, and attributes to the anti-symmetric vibrations of O6 cages. The blue shift of this peak scales to ~2.4 cm−1 per 1 GPa of stress. Another strong feature showing considerable blue shift is seen in the vicinity of 640 cm−1 and corresponds to one of rhombohedral distortion related soft modes. A weak mode, not frequently reported, is seen at around 420 cm−1 and corresponds to translation-like motions of fixed O6 cages.
Highlights
The LaMnO3 (LMO) has attracted the attention of scientists for both fundamental and application researches for decades due to a number of important effects that coexist within a single structure frame
Raman spectroscopy appears essential for the study of effects arising from magnetic orderings in LMO
The importance of Raman spectroscopy in the study of LMO arises from its high sensitivity to local disorders caused by Jahn-Teller distortions of MnO6 octahedra
Summary
The LaMnO3 (LMO) has attracted the attention of scientists for both fundamental and application researches for decades due to a number of important effects that coexist within a single structure frame. Our LMO samples are irradiated at extremely low doses by LaO− high energy ion beam, resulting in deeply pierced materials of certain density of doped sites.
Sign-in/Register to view highlights & summary 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.
