K. Iwasa et al., Evidence for crystal-lattice modulation due to spatially restricted enhancement of mixing effect in the low-carrier system CeSb, J PHYS JPN, 68(8), 1999, pp. 2498-2501
In order to investigate the unusual magnetic properties of the low-carrier
system CeSb, X-ray diffraction studies at low temperatures have been perfor
med. Below the magnetic transition temperature of T-N = 17K, several X-ray
satellite peaks and their temperature variations were observed, which indic
ate that the modulated structures of a crystal lattice coexist with the lon
g-period magnetic structures in CeSb. The observed wave numbers of the latt
ice modulations and the satellite-peak intensities are explained by the per
iodical arrangement of short and long distances between magnetic layers. Th
e short interlayer distance is due to enhancement of p-mixing effect which
is spatially restricted within the ferromagnetic layers of Gamma(8)-like Ce
ions appearing in the lattice of Gamma(7) Ce ions. The interlayer distance
due to Gamma(8)-like state is shorter la 0.1% than that between normal Gam
ma(7) Ce layers.