Abstract
Various properties of the strongly correlated electron system CeSb at ambient pressure as well as under high pressures have been investigated employing X-ray as a probe. The satellite peaks caused by the lattice modulation of CeSb in its AFP3 phase at ambient pressure have been analyzed successfully. The satellite peak intensity pattern was explained based on a model considering different effective ionic sizes and the scattering form factors for Γ 7 and Γ 8 -like Ce 3+ ions which appear in the ordered phase. The wave function for the Γ 8 -like Ce ion with larger moment was found almost the same as that of J z =5/2, which is consistent with the neutron diffraction experiment. At high pressures above about 1.9 GPa, rapid decrease of lattice constant was found below a certain critical temperature T L , below which a sudden increase of electrical resistivity appears. This phenomenon can be explained by the formation of magnetic polaron state below this temperature.
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