Abstract
In this work we study the physical properties of the layered cobaltites YBaCo 2 O 5.5 , focussing on the role of cationic disorder and size effects by a partial substitution of Ba by Ca. We have synthesized the polycrystalline compounds Y ( Ba 1 - x Ca x ) Co 2 O 5.5 with x = 0 , 0.05 and 0.10. We characterized the samples within the 5–500 K temperature range, using neutron diffraction, magnetic measurements and electrical resistivity experiments. We have found the magnetic properties to be strongly affected by the cationic substitution. Although the “122” perovskite structure seems unaffected by Ca addition, the magnetic arrangements of Co ions are drastically modified: the antiferromagnetic (AFM) long-range order is destroyed, and a ferrimagnetic phase is stabilized below T ∼ 290 K . For the sample with x = 0.05 a small fraction of AFM phase seems to coexist with a ferrimagnetic one below T ∼ 190 K , whereas for x = 0.10 the AFM order is completely lost.
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.
