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Possible evidence for a spin-state crossover in the Verwey state in Fe_3O_4 thin films

机译：Fe_3O_4薄膜在Verwey状态下自旋态交叉的可能证据

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摘要

In epitaxial thin films of magnetite a large change in magnetization across the Verwey transition has been observed. In the Verwey state, the sample magnetization appeared to be strongly reduced, in some samples even close to zero. Using superconducting quantum interference magnetometry, x-ray absorption near edge spectroscopy, and polarized neutron reflectometry, a simple rotation of the magnetization vector due to a change in magnetocrystalline anisotropy was excluded. The experimental data rather suggest an intrinsic loss of magnetic moment due to a possible transition into a low or intermediate spin state of Fe~(2+). This observation discloses a different aspect of the Verwey transition.
机译：在磁铁矿的外延薄膜中，已经观察到整个Verwey跃迁的磁化强度有很大变化。在Verwey状态下，样品的磁化强度似乎大大降低，有些样品甚至接近零。使用超导量子干涉磁力测量法，近边缘光谱法的X射线吸收和极化中子反射测量法，排除了由于磁晶各向异性变化而引起的磁化矢量的简单旋转。相反，实验数据表明，由于可能过渡到Fe〜（2+）的低或中自旋态，磁矩的固有损失。该观察结果揭示了Verwey过渡的另一个方面。

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  • 来源
    《Physical review》 |2016年第1期|014439.1-014439.5|共5页
  • 作者

    Mehrdad Baghaie Yazdi; Marton Major; Andrew Wildes; Fabrice Wilhelm; Andrei Rogalev; Wolfgang Donner; Lambert Alff;

  • 作者单位

    Technische Universitaet Darmstadt, Institute of Materials Science, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany;

    Technische Universitaet Darmstadt, Institute of Materials Science, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany,Wigner Research Centre for Physics, RMKI, Budapest, Hungary;

    Institut Laue-Langevin (ILL), BP 156, 38042 Grenoble Cedex 9, France;

    European Synchrotron Radiation Facility (ESRF), BP 220, 38043 Grenoble Cedex 9, France;

    European Synchrotron Radiation Facility (ESRF), BP 220, 38043 Grenoble Cedex 9, France;

    Technische Universitaet Darmstadt, Institute of Materials Science, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany;

    Technische Universitaet Darmstadt, Institute of Materials Science, Alarich-Weiss-Str. 2, 64287 Darmstadt, Germany;

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