2008/08/22 by Yogesh Singh, Singh, Yogesh, D. C. Johnston +1
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el)
paper · pdf · doi:10.48550/arxiv.0808.3123
openalex publication_date 2008/08/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Sr4Cr3O9 is the n = 2 member of a family of quasi-one-dimensional compounds An+2Tn+1O3n+3 (A = Ca, Sr, or Ba, T = transition metal, and n = 1 to ∞) having a crystal structure which consists of chains of n TO6 octahedra alternated by one TO6 trigonal prism running along the c-axis. The chains are arranged on a triangular lattice in the ab-plane. We report the synthesis, structure, magnetization M versus magnetic field H, magnetic susceptibility χversus temperature T and specific heat C versus T measurements on sintered and arc-melted polycrystalline samples of Sr4Cr3O9. The χdata have a T dependence which is typical of low-dimensional magnetic systems with dominant antiferromagnetic (AF) exchange interactions. Specifically, χ(T) shows a broad maximum at Tmax ≈ 200K for the sintered pellet and Tmax≈ 265K for the arc-melted sample, indicating the onset of short-range magnetic order. Below T = 15K we observe 2 anomalies in the χ(T) data for both samples suggesting the onset of long-range magnetic ordering. The corresponding anomalies in the C(T) data however are weak indicating that only a small amount of the expected magnetic entropy is recovered at the magnetic transitions and that strong short-range AF order exists above these temperatures.