Structure sine wave modulated

Fig. 7.17. Arrangement of magnetic moments in more complex ordered materials (a) a helimagnetic structure (b) a sine wave modulated structure.

Andre et al. (1993) have investigated the magnetic structure of TbPdSn. Below this structure is characterised by a sine wave modulated magnetic spin arrangement, which... 

The simplest amplitude-modulated structure is the collinear sine-wave modulated structure, illustrated in fig. 74 (sect, 3.2.7) in the case of PrNi2Si2, in which the moment at site i is given by... 

There is a large variety of single-0 antiferromagnetic structures (sine-wave) ampUtude-modulated, antiphase, simple antiferromagnetic, helimagnetic, etc. 

Heat capacity, electrical resistivity and neutron diffraction studies performed on NdRujGej indicate that in the temperature range from 17 K to 10 K, the compound exhibits two types of sine-wave modulated magnetic structures, having the wave vectors k = (0.19, 0.05,0.125) and k = (0.12,0.12,0) with the amplitude of the moment along the c-axis. At 10 K, a first-order transition to a ferromag-... 

The structure of iodine at four different pressures. The outlined face-centered unit cell in the 30-Gpa figure corresponds to that of a (distorted) cubic closest-packing of spheres. At 24.6 GPa four unit cells of the face-centered approximant structure are shown the structure is incommensurately modulated, the atomic positions follow a sine wave with a wave length of 3.89 x c. The amplitude of the wave is exaggerated by a factor of two. Lower left Dependence of the twelve interatomic contact distances on pressure... 

---