Figure 6
Schematic representation of the projection onto the ab plane of the 3-k magnetic and electric quadrupole ordering for the longitudinal (a) configuration and the two S-domains of the transverse configuration (b, c). The magnetic dipole moments are represented by blue arrows whereas the electric quadrupole moments are shown as green ellipsoids. The red spheres represent oxygen atoms. UO2 adopts the transverse structure, whereas the electric quadrupole longitudinal order is realized in NpO2 with zero magnetic dipole moment. Reprinted with permission from Wilkins et al. (2006). Copyright (2006) by the American Physical Society. |