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Journal Articles

Difference between local and average structures of La$$_3$$Ga$$_5$$SiO$$_{14}$$ crystal

Yoneda, Yasuhiro; Takeda, Hiroaki*; Shiosaki, Tadashi*; Mizuki, Junichiro

Japanese Journal of Applied Physics, Part 1, 46(10B), p.7163 - 7166, 2007/10

https://doi.org/10.1143/JJAP.46.7163
 Times Cited Count：1 Percentile：5.41(Physics, Applied)

The langasite (La$$_3$$Ga$$_5$$SiO$$_{14}$$, LGS) crystal grown by the Czochralski technique was investigated by X-ray diffraction measurements. The X-ray diffraction profiles of the LGS were consisted with sharp Bragg peaks and large amount of diffuse scatterings. The diffuse scattering inducated the existence of the local structure which is different from the average structure. The local structure was analyzed by the pair-distrivution function method. The local structure fluctuated by the chemical ordering of Ga and Si, and the local disordering feature of La.

Journal Articles

Magnetic and dielectric properties of Tb$$_{0.5}$$Ca$$_{0.5}$$MnO$$_{3}$$

Hiramitsu, Yusuke*; Yoshii, Kenji; Yoneda, Yasuhiro; Mizuki, Junichiro; Nakamura, Akio; Shimojo, Yutaka; Ishii, Yoshinobu*; Morii, Yukio; Ikeda, Naoshi*

Japanese Journal of Applied Physics, Part 1, 46(10B), p.7171 - 7174, 2007/10

https://doi.org/10.1143/JJAP.46.7171
 Times Cited Count：16 Percentile：53.11(Physics, Applied)

Magnetic and dielectric properties of a perivskite manganite Tb$$_{0.5}$$Ca$$_{0.5}$$MnO$$_{3}$$ were investigated. Magnetic measurements showed three characteristic temperatures, originating from charge ordering (300 K), antiferromagnetic ordering (120 K) and a transition to a glassy state (50 K). The coexistence of the charge and antiferromagnetic ordering was consistent with the result of powder neutron diffraction. AC dielectric measurements showed large dielectric constants of about 5000 at around room temperature. A temperature dependence of the dielectric constant changed just below the charge-ordering temperature. From the analysis of tan$$delta$$;, the activation energy for a domain-boundary motion was calculated to be about 0.09 eV. These results strongly suggest that the dielectric properties of this material are governed by the ordering and transfer of the Mn-3d charges.

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