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Multi-spin-state dynamics during insulator-metal crossover in LaCoO_3

机译:LaCoO_3中的绝缘体与金属交叉过程中的多自旋态动力学

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摘要

We have investigated the dynamics of spin-state crossover (SSC) for perovskite LaCoO_3 through optical phonons by means of infrared and inelastic x-ray spectroscopy. Upon thermally induced SSC, anomalously dispersionless Co-O bond stretching phonons coupled to the thermally excited spin state have been identified. The enhanced spin-state fluctuation irrespective of the presence of a clear charge gap suggests the emergence of complex spin-state disproportionation involving low-, intermediate-, and high-spin states due to the strong correlation among thermally activated spin states.
机译:我们已经通过红外和非弹性x射线光谱法研究了通过光子通过声子对钙钛矿LaCoO_3的自旋态交叉(SSC)动力学。在热诱导的SSC上,已经确定了耦合到热激发自旋态的异常无分散Co-O键拉伸声子。无论存在明显的电荷隙,增强的自旋态涨落都表明由于热激活自旋态之间的强相关性,涉及低,中和高自旋态的复杂自旋态歧化的出现。

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  • 来源
    《Physical review》 |2014年第8期|081109.1-081109.4|共4页
  • 作者单位

    Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan;

    Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan;

    Synchrotron Radiation Research Unit, JAEA/SPring-8, Sayo, Hyogo 679-5148, Japan,Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan;

    Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan,Department of Advanced Materials Science, University of Tokyo, Kashiwa 227-8561, Japan;

    Materials Dynamics Laboratory, RIKEN SPring-8 Center, Sayo, Hyogo 679-5148, Japan,Research and Utilization Division, JASRI/SPring-8, Sayo, Hyogo 679-5198, Japan;

    Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    metal-insulator transitions and other electronic transitions; spin crossover;

    机译:金属-绝缘体过渡和其他电子过渡;自旋交叉;

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