Author/Authors :
Yoshii، نويسنده , , Kenji and Hiramitsu، نويسنده , , Yusuke and Okajima، نويسنده , , Yuka and Yoneda، نويسنده , , Yasuhiro and Nishihata، نويسنده , , Yasuo and Mizuki، نويسنده , , Jun’ichiro and Nakamura، نويسنده , , Akio and Shimojo، نويسنده , , Yutaka and Ishii، نويسنده , , Yoshinobu and Morii، نويسنده , , Yukio and Ikeda، نويسنده , , Naoshi، نويسنده ,
Abstract :
Magnetic and dielectric properties of perovskite manganites R0.5Sr0.5MnO3 (R = Gd, Tb and Dy) have been investigated. DC and AC magnetic measurements showed short-range glassy magnetic ordering at Tg ∼ 40 K. Such ordering was observed by neutron diffraction and is ascribable to the size mismatch of R3+ and Sr3+ settled randomly at the same crystallographic site. Dielectric constants for each material were ∼1000–10,000 between ∼50 and ∼300 K and showed broad maximums above Tg. Dielectric dispersion showed poor coherency of the motion of polar regions, plausibly because of the size-mismatch effect; both the magnetic and dielectric properties of this system are governed by the randomness at the R/Sr site. The tan δ and EXAFS data suggest that the dielectric response is rooted in a transfer of the Mn-3d electrons.
Keywords :
A. Oxides , C. Neutron scattering , D. Magnetic properties , D. Dielectric properties , E. EXAFS
