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Report No.

High-resolution X-ray diffraction experiment on the octupole ordered phase in Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$

Inami, Toshiya; Michimura, Shinji*; Matsumura, Takeshi*; Hayashi, Yuya*; Sera, Masafumi*; Iga, Fumitoshi*

We have carried out a high-resolution X-ray diffraction experiment at low temperatures and in magnetic fields on Ce$$_{0.7}$$La$$_{0.3}$$B$$_6$$ that exhibits antiferrooctupole (AFO) order below $$T_O$$=1.4K. Ferroquadrupole moments that accompany the AFO order and a resultant rhombohedral deformation of the cubic lattice were theoretically predicted and experimetanlly supported. However, the sign and magnitude of the rhombohedral deformation have not yet been determined. We observe the splitting of Bragg peaks below $$T_O$$, which is consistent with a rhombohedral deformation of 4$$times10^{-5}$$ elongated along the [111] axis. The response of rhombohedral domains to magnetic fields also well agrees with theoretical calculations. A particular outcome of this experiment is that the magnitude of the induced quadrupole moments is precisely evaluated from the obtained shear strain.



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