2012/07/12 by Shiming Zhou, Zhou, Shiming, Yuqiao Guo +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1207.2818
arxiv created 2012/07/12 · openalex publication_date 2012/07/12 · arxiv updated 2012/07/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Magnetic properties of La1-xCaxCoO3 (0.10 ≤ x≤ 0.25) are systemically studied in this work. All the samples exhibits the ferromagnetic state at low temperatures. However, their inverse low-field magnetic susceptibilities shows a sharply downward deviation from high-temperature Curie-Weiss paramagnetic behavior well above the ferromagnetic transition temperature (TC), which indicates the presence of a ferromagnetic clustered state above TC. A detailed analysis on the susceptibilities reveals that the short-range state in these Ca-doped samples can be well described as the Griffiths phase. This characteristic is quite different from those of the clustered states above TC recently reported in Sr- and Ba-doped cobaltites, which are non-Griffith-like. It is proposed that this difference possibly arises from the unique dependence of magnetic interactions among Co3+ ions on the size of the dopant in the doped cobaltites. Based on these results, the magnetic diagram of the Ca-doped cobaltites is established.