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首页> 外文期刊>Physical review >Magnetic dimers and trimers in the disordered S = 3/2 spin system BaTi_(1/2)Mn_(1/2)O_3
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Magnetic dimers and trimers in the disordered S = 3/2 spin system BaTi_(1/2)Mn_(1/2)O_3

机译：无序S = 3/2自旋体系BaTi_（1/2）Mn_（1/2）O_3中的磁性二聚体和三聚体

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摘要

We report a structural-magnetic investigation by x-ray absorption spectroscopy (XAS), neutron diffraction, dc susceptibility (X_(dc)), and electron spin resonance (ESR) of the 12R-type perovskite BaTi_(1/2)Mn_(1/2)O_3. Our structural analysis by neutron diffraction supports the existence of structural trimers with chemically disordered occupancy of Mn~(4+) and Ti~(4+) 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 J_a/k_B = 200(2) K and J_B/k_B = 130(10) K, and orphan spins. Thus, BaTi_(1/2)Mn_(1/2)O_3 is proposed as a rare case of an intrinsically disordered S = 3/2 spin gap system with a frustrated ground state.
机译：我们报告了X射线吸收光谱（XAS），中子衍射，直流磁化率（X_（dc））和12R型钙钛矿BaTi_（1/2）Mn_（ 1/2）O_3。我们通过中子衍射进行的结构分析支持存在具有化学无序占据Mn〜（4+）和Ti〜（4+）离子的结构三聚体，并且XAS测量证实了Mn离子的化合价。通过在2≤T≤1000 K的温度区间内结合直流磁化率和X波段（9.4 GHz）电子自旋共振来探索磁性。提出了一种通过考虑磁性二聚体和交换常数J_a / k_B = 200（2）K和J_B / k_B = 130（10）K的三聚体，以及孤子自旋。因此，BaTi_（1/2）Mn_（1/2）O_3被提议作为具有受挫基态的内在无序S = 3/2自旋间隙系统的罕见情况。

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  • 来源
    《Physical review》 |2015年第22期|224416.1-224416.8|共8页
  • 作者

    F. A. Garcia; U. F. Kaneko; E. Granado; J. Sichelschmidt; M. Hoelzel; J. G. S. Duque; C. A. J. Nunes; R. P. Amaral; P. Marques-Ferreira; R. Lora-Serrano;

  • 作者单位

    IFUSP, Univ. de Sao Paulo, 05508-090, Sao Paulo-SP, Brazil;

    Inst Fis Gleb Wataghin, Univ. Estadual de Campinas, 13083-970, Campinas-SP, Brazil;

    Inst Fis Gleb Wataghin, Univ. Estadual de Campinas, 13083-970, Campinas-SP, Brazil;

    Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany;

    Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM Ⅱ), Technische Universitaet Muenchen, Lichtenbergstr. 1, D-85747 Garching, Germany;

    Nucleo de Fisica, Campus Itabaiana, UFS, 49500-000, Itabaiana, SE, Brazil;

    Univ. Fed. de Uberlandia, Instituto de Fi'sica, 38400-902, Uberlandia-MG, Brazil;

    Univ. Fed. de Uberlandia, Instituto de Fi'sica, 38400-902, Uberlandia-MG, Brazil;

    Univ. Fed. de Uberlandia, Instituto de Fi'sica, 38400-902, Uberlandia-MG, Brazil;

    Univ. Fed. de Uberlandia, Instituto de Fi'sica, 38400-902, Uberlandia-MG, Brazil;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    quantized spin models; exchange and superexchange interactions;

    机译：量化自旋模型交换和超交换交互;

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