2012/06/18 by F. A. Garcia, Garcia, F. A., U. F. Kaneko +22
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #FOS: Physical sciences #Magnetic and transport properties of perovskites and related materials #Multiferroics and related materials #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1206.3813
8 pages, 7 figures, final version to appear in Phys Rev B
openalex publication_date 2012/06/18 · arxiv created 2015/06/05 · arxiv updated 2015/06/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report a structural/magnetic investigation by X-ray absorption spectroscopy (XAS), neutron diffraction, dc-susceptibility (χdc) and electron spin resonance (ESR) of the 12R-type perovskite BaTi1/2Mn1/2O3. Our structural analysis by neutron diffraction supports the existence of structural trimers with chemically disordered occupancy of Mn4+ and Ti4+ ions, with the valence of the Mn ions confirmed by the XAS measurements. The magnetic properties are explored by combining dc-susceptibility and X-band (9.4 GHz) electron spin resonance, both in the temperature interval of 2≤ T≤1000 K. A scenario is presented under which the magnetism is explained by considering magnetic dimers and trimers, with exchange constants Ja/kB=200(2) K and Jb/kB=130(10) K, and orphan spins. Thus, BaTi1/2Mn1/2O3 is proposed as a rare case of an intrinsically disordered S=3/2 spin gap system with a frustrated ground state.