Abstract
A softening of bending mode and a hardening of stretching mode on cooling are observed in infrared spectra of La0.25Ca0.75MnO3 nanoparticles with particle sizes (D) of 40–1000 nm, indicating part of melting charge ordering in the samples. The particle size variations of the inverse of effective number of carriers neff∗ and optical gap show their maxima around D = 350 nm at T = 6 K and then decrease as D reduces from 350 nm to 40 nm. The signals of the decreasing localization of charge carriers provide the possible evidences for the suppression of charge ordering with the decreasing particle size. These observations are explained based on the model of disordered surface and bulk-like core.
Sign-in/Register to access full text options 
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.
