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首页> 外文期刊>Physical review >Magnetic and orbital correlations in multiferroic CaMn_7O_(12) probed by x-ray resonant elastic scattering
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Magnetic and orbital correlations in multiferroic CaMn_7O_(12) probed by x-ray resonant elastic scattering

机译：由X射线共振弹性散射探测的多二二种CAMN_7O_（12）中的磁性和轨道相关性

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摘要

The quadruple perovskite CaMn_7O_(12) is a topical multiferroic in which the hierarchy of electronic correlations driving structural distortions, modulated magnetism, and orbital order is not well known and may vary with temperature. X-ray resonant elastic scattering (XRES) provides a momentum-resolved tool to study these phenomena, even in very small single crystals, with valuable information encoded in its polarization and energy dependence. We present an application of this technique to CaMn_7O_(12). By polarization analysis, it is possible to distinguish superstructure reflections associated with magnetic order and orbital order. Given the high momentum resolution, we resolve a previously unknown splitting of an orbital-order superstructure peak, associated with a distinct locked-in phase at low temperatures. A second set of orbital-order superstructure peaks can then be interpreted as a second-harmonic orbital signal. Surprisingly, the intensities of the first- and second-harmonic orbital signal show disparate temperature and polarization dependence. This orbital reordering may be driven by an exchange mechanism that becomes dominant over the Jahn-Teller instability at low temperature.
机译：四肢蠕动Camn_7O_（12）是局部的多体型，其中驾驶结构失真，调制磁性和轨道顺序的电子相关性的层次是不公知的，并且可以随温度而变化。 X射线共振弹性散射（XRES）提供了一种势态分辨的工具，即使在非常小的单晶中也可以研究这些现象，其极化和能量依赖性编码的有价值的信息。我们向Camn_7O_（12）呈现了这种技术的应用。通过偏振分析，可以区分与磁秩序和轨道顺序相关的上部结构反射。鉴于高动量分辨率，我们解析了在低温下与不同锁定的相位相关的轨道阶层结构峰的先前未知的分裂。然后可以将第二组轨道上结构峰被解释为第二谐波轨道信号。令人惊讶的是，第一和第二谐波轨道信号的强度显示不同的温度和极化依赖性。这种轨道重新排序可以由交换机制驱动，该机制在低温下在jAhn-theller稳定性上变得优势。

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  • 来源
    《Physical review》 |2020年第22期|224430.1-224430.6|共6页
  • 作者

    K. Gautam; S. S. Majid; S. Francoual; A. Ahad; K. Dey; M. C. Rahn; R. Sankar; F. C. Chou; D. K. Shukla;

  • 作者单位

    UGC-DAE Consortium for Scientific Research Khandwa Road Indore 452001 India;

    Department of Physics Aligarh Muslim University Aligarh 202002 India;

    Deutsches Elektronen-Synchrotron Notkestrasse 85 D-22607 Hamburg Germany;

    Department of Physics Aligarh Muslim University Aligarh 202002 India;

    UGC-DAE Consortium for Scientific Research Khandwa Road Indore 452001 India;

    Department of Physics Clarendon Laboratory University of Oxford Oxford OX1 3PU United Kingdom Institute tor Solid State and Materials Physics Technical University of Dresden 01062 Dresden Germany;

    Institute of Physics Academia Sinica Taipei 11529 Taiwan Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan;

    Center for Condensed Matter Sciences National Taiwan University Taipei 10617 Taiwan;

    UGC-DAE Consortium for Scientific Research Khandwa Road Indore 452001 India;

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