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首页> 外文期刊>Physical review >Magnetic structure, magnetization, and magnetotransport properties of (Ba,Sr)M_(2±x)T_(4-+x)O_(11) (M=Fe,Co; T=Ru,Ti)
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Magnetic structure, magnetization, and magnetotransport properties of (Ba,Sr)M_(2±x)T_(4-+x)O_(11) (M=Fe,Co; T=Ru,Ti)

机译：（Ba，Sr）M_（2±x）T_（4- + x）O_（11）（M = Fe，Co; T = Ru，Ti）的磁性结构，磁化和磁输运性质

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摘要

Hexagonal R-type ferrites (Ba,Sr)M_(2±x)T_(4-+x)O_(11) (M=Fe,Co; T=Ru,Ti) were studied via neutron and x-ray diffraction, magnetization, and electrical transport measurements. Magnetization data for single-crystal BaFe_(3.26)Ti_(2.74)O_(11) reveal two magnetic transitions at T_1=250 K and T_2=84 K, which indicates complex magnetic order driven by competing interactions on a frustrated lattice with a noncentrosymmetric structure. Magnetization data for single-crystal BaCo_(1.85)Ru_(4.15)O_(11) reveal soft ferromagnetic order at T_C=105 K with an easy direction perpendicular to the c axis. Neutron diffraction data for polycrystalline BaCo_(1.68)Ru_(4.32)O_(11) indicate a nearly compensated arrangement of spins lying within the a-b plane with a possible canting out of the plane that yields nonzero scalar spin chirality. The transverse magnetoresistivity ρ_(xy) of single-crystal BaCo_(0.85)Ru_(4.15)O_(11) for current J∥H ⊥c axis is typical of an anomalous Hall effect observed in ferromagnets, whereas for J⊥H∥c axis, ρ_(xy) is a nonmonotonic function of the magnetic field, consistent with a topological Hall effect that depends upon scalar spin chirality. Neutron diffraction reveals transitions to ferrimagnetic order at T_C=262(1) K for single-crystal SrFe_(2.6)Ru_(3.4)O_(11), and at T_C=403 K for polycrystalline SrFe_(2.96)Ru_(3.04)O_(11) (refined as a collinear structure at T=5 K).
机译：通过中子和X射线衍射研究了六角形R型铁氧体（Ba，Sr）M_（2±x）T_（4- + x）O_（11）（M = Fe，Co; T = Ru，Ti），磁化和电传输测量。单晶BaFe_（3.26）Ti_（2.74）O_（11）的磁化数据显示在T_1 = 250 K和T_2 = 84 K处有两个磁跃迁，这表明由非中心对称结构的受挫晶格上的竞争相互作用驱动的复杂磁阶。单晶BaCo_（1.85）Ru_（4.15）O_（11）的磁化数据显示，在T_C = 105 K处，软铁磁有序，其垂直方向垂直于c轴。多晶BaCo_（1.68）Ru_（4.32）O_（11）的中子衍射数据表明，在a-b平面内的自旋几乎得到了补偿，其可能倾斜自平面外，从而产生非零的标量自旋手性。对于当前J∥H⊥c轴，单晶BaCo_（0.85）Ru_（4.15）O_（11）的单晶BaCo_（0.85）Ru_（11）的横向磁致电阻率ρ_（xy）是在铁磁体中观察到的反常霍尔效应的典型特征，而对于J⊥H∥c轴而言，ρ_（xy）是磁场的非单调函数，与取决于标量自旋手性的拓扑霍尔效应一致。中子衍射揭示了对于单晶SrFe_（2.6）Ru_（3.4）O_（11）在T_C = 262（1）K，对于多晶SrFe_（2.96）Ru_（3.04）O_ { 11）（细化为T = 5 K时的共线结构）。

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  • 来源
    《Physical review》 |2010年第18期|P.184415.1-184415.11|共11页
  • 作者

    L. Shlyk; B. G. Ueland; J. W. Lynn; Q. Huang; L. E. De Long; S. Parkin;

  • 作者单位

    Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA;

    NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    rnNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    rnNIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA;

    rnDepartment of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA;

    rnDepartment of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA;

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  • 关键词

    ferrimagnetics; manganites;

    机译：亚铁磁;锰矿;

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