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Report No.

Magnetic and crystal structure of strong neutron absorber SmBaMn$$_{2}$$O$$_{6}$$

Kiyanagi, Ryoji ; Yamada, Shigeki*; Aoki, Hiroshi*; Sagayama, Hajime*; Moyoshi, Taketo*; Nakao, Akiko*; Arima, Takahisa*

Manganites represented as RE$$_{1-x}$$AE$$_{x}$$MnO$$_{3}$$ (Re = trivalent rare earth, AE = divalent alkaline earth) has drawn great attention because of their fascinating and variety of physical properties. SmBaMn$$_{2}$$O$$_{6}$$ is one kind with Sm and Ba ordered at A-site. This material exhibit a charge-orbital ordering at 380K, another charge-orbital ordering and an antiferromagnetic phase transition around 200K, and an anomaly was also observed at 10K in a magnetic susceptibility data. In order to clarify the detail of the phase transition around 200K and 10K, a single crystal of SmBaMn$$_{2}$$O$$_{6}$$ was measured on the single crystal diffractometer at J-PARC/MLF, SENJU. The measurement revealed the existence of magnetic superlattice reflections below 180K, which indicated the CE-type spin ordering pattern, which is most commonly seen in this type of materials. A careful measurement of the superlattice reflections clarified that the charge-orbital ordering occurred slightly above the antiferromagnetic phase transition temperature.



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