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首页> 外文期刊>Physical review >Magnetic excitations in the metallic single-layer ruthenates Ca_(2_x)Sr_xRuO_4 studied by inelastic neutron scattering
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Magnetic excitations in the metallic single-layer ruthenates Ca_(2_x)Sr_xRuO_4 studied by inelastic neutron scattering

机译：非弹性中子散射研究金属单层钌酸盐Ca_（2_x）Sr_xRuO_4中的磁激发

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摘要

By inelastic neutron scattering, we have analyzed the magnetic correlations in the paramagnetic metallic region of the series Ca_(2_x)Sr_xRuO_4, 0.2 ≤ x ≤ 0.62. We find different contributions that correspond to two-dimensional ferromagnetic fluctuations and to fluctuations at incommensurate wave vectors Q_1~(IC) = (0.11,0,0), Q_2~(IC) = (0.26,0,0), and Q_(αβ)~(IC) = (0.3,0.3,0). These components constitute the measured response as a function of the Sr concentration x, of the magnetic field, and of the temperature. A generic model is applicable to metallic Ca_(2_x)Sr_xRuO_4 close to the Mott transition, in spite of their strongly varying physical properties. The amplitude, characteristic energy, and width of the incommensurate components vary only slightly as functions of x, but the ferromagnetic component depends sensitively on concentration, temperature, and magnetic field. While ferromagnetic fluctuations are very strong in Ca_(1.38)Sr_(0.62)RuO_4 with a low characteristic energy of 0.2 meV at T = 1.5K, they are strongly suppressed in Ca_(1.8)Sr_(0.2)RuO4, but reappear upon the application of a magnetic field, and form a magnon mode above the metamagnetic transition. The inelastic neutron scattering results document how the competition between ferromagnetic and incommensurate antiferromagnetic instabilities governs the physics of this system.
机译：通过非弹性中子散射，我们分析了Ca_（2_x）Sr_xRuO_4系列0.2≤x≤0.62的顺磁性金属区域的磁相关性。我们发现了不同的贡献，它们分别对应于二维铁磁波动和不相称波矢量Q_1〜（IC）=（0.11,0,0），Q_2〜（IC）=（0.26,0,0）和Q_（ αβ）〜（IC）=（0.3,0.3,0）。这些成分构成了作为Sr浓度x，磁场和温度的函数的测量响应。尽管金属模型的物理特性变化很大，但通用模型适用于接近Mott转变的金属Ca_（2_x）Sr_xRuO_4。不相称分量的振幅，特征能量和宽度仅随x的函数而略有变化，但铁磁分量敏感地取决于浓度，温度和磁场。 Ca_（1.38）Sr_（0.62）RuO_4中的铁磁波动非常强，在T = 1.5K时特征能量仅为0.2 meV，但在Ca_（1.8）Sr_（0.2）RuO4中被强烈抑制，但在应用时会再次出现磁场，并在超磁跃迁上方形成磁振子模式。非弹性中子散射结果证明了铁磁和不相称的反铁磁不稳定性之间的竞争如何控制该系统的物理性质。

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  • 来源
    《Physical review》 |2011年第5期|p.054429.1-054429.12|共12页
  • 作者

    P. Steffens; O. Friedt; Y. Sidis; P. Link; J. Kulda; K. Schmalzl; S. Nakatsuji; M. Bradenl;

  • 作者单位

    II.Physikalisches Institut, Universitdt zu Koln, Zulpicher Strasse 77, D-50937 Koln, Germany,Institut Laue Langevin, 6 Rue Jules Horowitz BP 156, F-38042 Grenoble Cedex 9, France;

    II.Physikalisches Institut, Universitdt zu Koln, Zulpicher Strasse 77, D-50937 Koln, Germany;

    Laboratoire Leon Brillouin, Centre d'Etudes Atomiques/Centre National de la Recherche Scientifique (CEA/CNRS),F-91191 Gif-sur-Yvette Cedex, France;

    Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM-II), TU Munchen, Lichtenbergstrasse 1, D-85747 Garching, Germany,Spektrometer PANDA, Institut fiir Festkorperphysik, TU Dresden,Germany;

    Institut Laue Langevin, 6 Rue Jules Horowitz BP 156, F-38042 Grenoble Cedex 9, France;

    Institute of Solid State Research (IFF), Forschungszentrum Jiilich GmbH, Jtilich Centre for Neutron Science (JCNS) at Institut Laue-Langevin (ILL), F-38042 Grenoble Cedex 9, France;

    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan;

    II.Physikalisches Institut, Universitdt zu Koln, Zulpicher Strasse 77, D-50937 Koln, Germany;

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    ruthenates; magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, margina; neutron inelastic scattering;

    机译：钌酸磁相边界（包括磁跃迁;超磁性等）;非常规机制（自旋涨落;极化子和双极化子;共振价键模型;任意子机制;边缘;中子非弹性散射;

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