Magnetic dimers and trimers in the disordered S=32 spin system BaTi1/2Mn1/2O3

F. A. Garcia, U. F. Kaneko, E. Granado, J. Sichelschmidt, M. Hölzel, J. G. S. Duque, C. A. J. Nunes, R. P. Amaral, P. Marques-Ferreira, and R. Lora-Serrano
Phys. Rev. B 91, 224416 – Published 11 June 2015

Abstract

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 2T1000 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=32 spin gap system with a frustrated ground state.

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  • Received 27 May 2014
  • Revised 7 May 2015

DOI:https://doi.org/10.1103/PhysRevB.91.224416

©2015 American Physical Society

Authors & Affiliations

F. A. Garcia1,*, U. F. Kaneko2, E. Granado2, J. Sichelschmidt3, M. Hölzel4, J. G. S. Duque5, C. A. J. Nunes6, R. P. Amaral6, P. Marques-Ferreira6, and R. Lora-Serrano6

  • 1IFUSP, Univ. de São Paulo, 05508-090, São Paulo-SP, Brazil
  • 2Inst Fis Gleb Wataghin, Univ. Estadual de Campinas, 13083-970, Campinas-SP, Brazil
  • 3Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 4Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Technische Universität München, Lichtenbergstr. 1, D-85747 Garching, Germany
  • 5Nucleo de Física, Campus Itabaiana, UFS, 49500-000, Itabaiana, SE, Brazil
  • 6Univ. Fed. de Uberlândia, Instituto de Física, 38400-902, Uberlândia-MG, Brazil

  • *fgarcia@if.usp.br

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Vol. 91, Iss. 22 — 1 June 2015

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