Abstract
We present the results of the electron paramagnetic resonance (EPR) study in the mixed valence perovskite La 1− x Ca x MnO 3+ y for 16O and 18O isotope substituted compounds. The characteristic differences observed in EPR intensity and linewidth for the two isotope samples can be explained by a model in which a bottlenecked spin relaxation takes place from the exchange-coupled constituent Mn 4+ ions via the Mn 3+ Jahn-Teller ions to the lattice. For x=0.2 the ferromagnetic exchange energy J exhibits a 16O/ 18O oxygen isotope effect of ∼ t-10%. The observed isotope effects provide the microscopic evidence for the formation of Jahn-Teller polarons in doped manganese perovskites.
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.
