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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*

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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Category:Physics, Applied

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