Goulon J, Rogalev A, Wilhelm F, Goulon-Ginet C, Carra P, Cabaret D, Brouder C
European Synchrotron Radiation Facility (E.S.R.F.), Boîte Postale 220, 38043 Grenoble Cedex, France.
Phys Rev Lett. 2002 Jun 10;88(23):237401. doi: 10.1103/PhysRevLett.88.237401. Epub 2002 May 28.
We report the first experimental detection of x-ray magnetochiral dichroism in magnetoelectric Cr2O3. This dichroism, which does not require any polarized x-ray beam, is related to the time-reversal odd part of the optical activity tensor dominated by electric dipole-electric quadrupole E1E2 interference terms. The experiments were carried out using either a single crystal or a powdered pellet required to grow a single antiferromagnetic domain by magnetoelectric annealing. This new element (edge) specific spectroscopy offers unique access to the atomic orbital anapole moment Omega-z.
我们报道了在磁电体Cr2O3中首次对X射线磁手性二向色性进行的实验检测。这种二向色性不需要任何偏振X射线束，它与由电偶极 - 电四极E1E2干涉项主导的光学活性张量的时间反演奇异性部分有关。实验使用单晶或通过磁电退火生长单个反铁磁畴所需的粉末压片进行。这种新的元素（边缘）特异性光谱学为获取原子轨道无极矩Ω - z提供了独特途径。
