Abstract
The magnetic properties of the Dy 1− x Ca x MnO 3 solid solution (0≤ x≤0.60) have been studied as a function of temperature and magnetic field. A paramagnetic state, with the Curie–Weiss temperature Θ changing from −25 to +14 K, is observed from x=0 to x=0.3. At higher calcium concentration, charge ordering effects seem to dominate. Dy–Dy interactions present in the pure DyMnO 3 manganite ( T N=9.5 K) persist in the solid solution up to x=0.3. The Mn sublattice orders ferromagnetically at T c∼80 K. The ZFC/FC magnetization cycles show a ferrimagnetic-like system, in which negatively-polarized dysprosium moments behave as free spins ( T> T N) under the internal field of the ordered Mn sublattice. The local field at a given Dy site depends on the exchange (negative) interaction between both sublattices, resulting in a reversal of the magnetization when the magnetic moment of the Dy sublattice exceeds the one of the ferromagnetic network.
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.
