Resonant enhancements at nonmagnetic ions: new possibilities for magnetic X-ray scattering.
Resonant enhancements at nonmagnetic ions: new possibilities for magnetic X-ray scattering.
复制标题
非磁性离子的共振增强：磁 X 射线散射的新可能性。
DOI：
10.1103/physrevlett.86.4128
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发表时间：
2001
影响因子：
8.6
通讯作者：
A. Czopnik
中科院分区：
文献类型：
--
作者：
D. Mannix;A. Stunault;N. Bernhoeft;L. Paolasini;G. Lander;C. Vettier;F. de Bergevin;D. Kaczorowski;A. Czopnik
用铀反铁磁化合物进行的同步加速器实验已经发现，在名义上的负离子的K边缘处的磁散射强度有很大的增强（>1000），例如，Ga和As。能量的宽度，相对于白色线的位置，以及方位角和偏振依赖性允许将信号与从1s到4p状态的E1偶极对称性的跃迁相关联。在动量空间中，信号在反铁磁波矢处表现出长程有序。我们讨论可能的渠道能够产生所观察到的增强。
Synchrotron experiments with uranium antiferromagnetic compounds have discovered large ( >1000) enhancements of the magnetic scattering intensities at the K edges of nominally nonmagnetic anions, e.g., Ga and As. The width in energy, the position with respect to the white line, and the azimuthal and polarization dependencies permit one to associate the signal with transitions of E1 dipole symmetry from 1s to 4p states. In momentum space, the signal exhibits long-range order at the antiferromagnetic wave vector. We discuss possible channels capable of generating the observed enhancements.