X射线共振布拉格衍射中反铁磁绝缘相V2O3反极性矩的实验证据
Experimental evidence of anapolar moments in the antiferromagnetic insulating phase of V2O3 obtained from x-ray resonant Bragg diffraction
摘要：
本文用共振X射线布拉格衍射方法研究了Mott-Hubbard绝缘体V $_2$ O $_3$的反铁磁绝缘相。结合从方位角扫描，线性入射偏振扫描，并通过拟合收集的数据，来自建立的化学I2/a和磁空间群的散射振幅得到的信息，我们提供的证据的有序图案的非极性时刻（这是从宇称违反耦合到电磁场的结果）。实验数据（方位角依赖性和偏振分析）收集在空间群禁戒布拉格反射成功占我们的模型中的钒磁电多极。我们证明，共振X射线衍射强度在所有空间群禁布喇格反射的$(hkl)_m$与奇数$h$的E1-E2事件产生的。确定的张量参数提供了一个测试从头计算在这种材料中，可以导致更深入和更定量的理解的物理性质的V $_2$ O $_3$。
英文摘要：
We have investigated the antiferromagnetic insulating phase of the Mott-Hubbard insulator V$_2$O$_3$ by resonant x-ray Bragg diffraction at the vanadium K-edge. Combining the information obtained from azimuthal angle scans, linear incoming polarization scans and by fitting collected data to the scattering amplitude derived from the established chemical I2/a and magnetic space groups we provide evidence of the ordering motif of anapolar moments (which results from parity violation coupling to an electromagnetic field). Experimental data (azimuthal dependence and polarization analysis) collected at space-group forbidden Bragg reflections are successfully accounted within our model in terms of vanadium magnetoelectric multipoles. We demonstrate that resonant x-ray diffraction intensities in all space-group forbidden Bragg reflections of the kind $(hkl)_m$ with odd $h$ are produced by an E1-E2 event. The determined tensorial parameters offer a test for ab-initio calculations in this material, that can lead to a deeper and more quantitative understanding of the physical properties of V$_2$O$_3$.
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