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~(17)O NMR study of the doped electrons in lightly oxygen-deficient cubic SrMnO_(3-x)

机译：轻度缺氧的立方SrMnO_（3-x）中掺杂电子的〜（17）O NMR研究

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摘要

The spin susceptibility of the localized Mn(t_(2g)) electrons, χ_s, and the spatially distributed spin density of the doped electrons were investigated by ~(17)O nuclear magnetic resonance (NMR) in the paramagnetic (PM) and antiferromagnetic (AF) phases of electron-doped SrMnO_(3-x) ceramics with the cubic structure. Three lightly doped samples (2x ＜ 0.015) were studied with T_N = 220 K-240 K. In the PM state χ_s increases gradually from T_N and reaches a broad maximum above ～ 1.5 T_N. The gapped behavior of χ_s indicates a low-dimensional short-range spin order persisting above T_N These short-range one-dimensional correlations are consistent with ~(17)O NMR results obtained at room temperature, which show that Mn magnetic moments are aligned along the edges of the cubic unit cell. Above 350 K all doped electrons are fast-moving e_g electrons. They provide the uniform polarization of the localized spins which increases χ_s and the increasing doping shifts the oxygen-deficient SrMnO_(3-x) oxide towards a ferromagnetic (FM) metallic state. At lower T the doped electrons are heterogeneously distributed in the oxide: The fraction of the fast-moving electrons diminishes and vanishes below 100 K, while the remaining doped electrons slow down their hopping and each of them creates a FM domain. These FM domains which are detected below 10 K by ~(55)Mn NMR can be considered as small-size magnetic polarons. Their T-activated hopping in the G-type AF lattice was probed by ~(17)O spin-echo experiments. The energy barrier of hopping shows a trend to grow with increasing doping, indicating that the de Gennes metallic ground state cannot be achieved in oxygen-deficient SrMnO_(3-x) oxides, probably due to detrimental oxygen vacancy defects.
机译：通过〜（17）O核磁共振（NMR）在顺磁（PM）和反铁磁（PM）中研究了局部Mn（t_（2g））电子的自旋磁化率χ_s，以及掺杂电子的空间分布自旋密度。 AF）具有立方结构的电子掺杂SrMnO_（3-x）陶瓷相。研究了三个轻度掺杂样品（2x ＜0.015），T_N = 220 K-240K。在PM状态下，χ_s从T_N逐渐增加，并在〜1.5 T_N以上达到最大。 χ_s的带隙行为表明低维短程自旋顺序在T_N之上持续存在。这些短程一维相关性与室温下获得的〜（17）O NMR结果一致，表明Mn磁矩沿立方晶胞的边缘。在350 K以上，所有掺杂电子都是快速移动的e_g电子。它们提供了局部自旋的均匀极化，从而使χ_s增大，并且掺杂的增加使缺氧的SrMnO_（3-x）氧化物向铁磁（FM）金属态移动。在较低的T下，掺杂的电子异质分布在氧化物中：在100 K以下，快速移动的电子的比例减小并消失，而其余的掺杂的电子则减慢其跃变，并且每个电子都产生FM域。通过〜（55）Mn NMR在10 K以下检测到的这些FM域可以看作是小型磁极化子。通过〜（17）O自旋回波实验探究了它们在G型AF晶格中的T激活跳跃。跳跃的能垒显示出随着掺杂增加而增长的趋势，表明可能由于有害的氧空位缺陷，在缺氧的SrMnO_（3-x）氧化物中无法达到de Gennes金属基态。

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  • 来源
    《Physical review》 |2016年第17期|174413.1-174413.10|共10页
  • 作者

    A. Trokiner; S. Verkhovskii; Z. Volkova; A. Gerashenko; K. Mikhalev; A. Germov; A. Yakubovskii; A. Korolev; B. Dabrowski; A. Tyutyunnik;

  • 作者单位

    LPEM, ESPCI Paris, PSL Research University, CNRS, Sorbonne Universites, UPMC University, 10 rue Vauquelin, F-75005 Paris, France;

    LPEM, ESPCI Paris, PSL Research University, CNRS, Sorbonne Universites, UPMC University, 10 rue Vauquelin, F-75005 Paris, France,Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    LPEM, ESPCI Paris, PSL Research University, CNRS, Sorbonne Universites, UPMC University, 10 rue Vauquelin, F-75005 Paris, France,Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    Russian Research Centre Kurchatov Institute, 123182 Moscow, Russia;

    Institute of Metal Physics, Ural Branch of Russian Academy of Sciences, 620990 Ekaterinburg, Russia;

    Department of Physics, Northern Illinois University, DeKalb, Illinois 60115, USA;

    Institute of Solid State Chemistry, Ural Branch of Russian Academy of Sciences, 620018 Ekaterinburg, Russia;

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