Figure 2
Neutron spherical polarization matrix elements for the (0 1 0.23) magnetic reflection of (ND4)2[FeCl5(D2O)]. (Top) Observed (solid color columns and error bars) and calculated (black rectangles) neutron spherical polarization matrix elements, Pij, for the (0 1 0.23) magnetic reflection of a (ND4)2[FeCl5(D2O)] crystal oriented with a* parallel to the Z-axis. Left: Results corresponding to the cycloidal phase (T = 4 K) for the sample cooled in zero electric field (orange) and under a negative (purple) and positive (red) electric field of 25 kV cm−1 applied along a*. The calculated values are the results of the joint fit of neutron spherical polarimetry and unpolarized neutron diffraction intensities. Right: Experimental results (orange bars) corresponding to the sinusoidal phase (T = 7 K) for the sample cooled at zero-field, compared with the calculated values for a sinusoidal magnetic structure with moments parallel to c and a directions (green and black rectangles, respectively). Inset: Scheme of the experimental geometry showing the crystal (red/green/blue arrows) and Blume (gray arrows) reference frames, together with the cycloid rotation plane with one particular magnetic moment (both in magenta).(Bottom) Temperature dependence of observed neutron spherical polarization matrix elements, Pij, for the (0 1 0.23) magnetic reflection in zero-E-field cooling and negative E-field cooling conditions.
