Abstract
${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ doped with Fe were studied by M\"ossbauer spectroscopy and neutron powder diffraction. The M\"ossbauer spectra (MS) reveal that Fe substitutes for Mn as ${\mathrm{Fe}}^{3+}$ $(S=5/2)$ and is antiferromagnetically coupled to the Mn host lattice. The magnetic behavior, from the neutron diffraction data, is that of a typical 3D Heisenberg ferromagnet. The temperature evolution of the MS differs from that of the neutron data, especially above 40 K. The data can be interpreted using a model based on an antiferromagnetic impurity in a ferromagnetic host. In such a system, the ground state is inhomogeneous resulting in spin states with reduced spin and the spin excitations are localized in the immediate neighborhood of the impurity atoms. Finally, at $T\ensuremath{\approx}{0.9T}_{c}$ the MS indicate the onset of charge localization.
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.
