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首页> 外文期刊>Journal of Applied Physics >Direct measurement of the low temperature spin state transitions in La_(1-x)Sr_xCoO_3 (0.05 < x < 0.3)
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Direct measurement of the low temperature spin state transitions in La_(1-x)Sr_xCoO_3 (0.05 < x < 0.3)

机译:直接测量La_(1-x)Sr_xCoO_3中的低温自旋态转变(0.05 <x <0.3)

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摘要

Sr-doped LaCoO_3 has a complex magnetic phase diagram, which is believed to be directly correlated to changes in the crystal structure and ordering of the Co~(3+) spin states. In this work, we study the low temperature Co~(3+)-ion spin state transitions in Sr-doped LaCoO_3 around the critical doping concentration where a metal to insulator transition has been observed using electron energy-loss spectros-copy of the O K-edge combined with the Co L-edge fine structure. We measure the local spin state of the Co~(3+)-ions and we demonstrate that the Co~(3+) spin-state transition only occurs in La_(0.95)Sr_(0.05)CoO_3 single-crystal materials in the temperature range accessible by LN_2 in-situ cooling, while no structural symmetry change is observed. The presence of this low-temperature spin-state transition in La_(1-x)Sr_xCoO_3 (x < 0.17) has been proposed as the origin of the percolative magnetic ordering in doped LaCoO_3.
机译:掺Sr的LaCoO_3具有复杂的磁相图,据信这与晶体结构的变化和Co〜(3+)自旋态的有序直接相关。在这项工作中,我们研究了Sr掺杂LaCoO_3在临界掺杂浓度附近的低温Co〜(3+)离子自旋态跃迁,其中使用O的电子能谱分析观察到了金属到绝缘体的跃迁。 K边缘结合Co L边缘的精细结构。我们测量了Co〜(3+)离子的局部自旋态,并证明了Co〜(3+)自旋态跃迁仅在温度为La_(0.95)Sr_(0.05)CoO_3的单晶材料中发生。 LN_2原位冷却可达到该范围,但未观察到结构对称性变化。有人提出在La_(1-x)Sr_xCoO_3(x <0.17)中存在这种低温自旋态跃迁,作为掺杂LaCoO_3中渗流磁排序的起源。

著录项

  • 来源
    《Journal of Applied Physics》 |2014年第23期|233701.1-233701.5|共5页
  • 作者

    A. Gulec; R. F. Klie;

  • 作者单位

    Department of Physics, University of Illinois at Chicago, Chicago 60607, USA;

    Department of Physics, University of Illinois at Chicago, Chicago 60607, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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