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Structural study on the phase separation in Sm1-xCaxMnO3 (0.8≤x≤0.92)

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9 Author(s)
Kim, Bongju ; Department of Physics, Pusan National University, Pusan 609-735, Republic of Korea ; Tong, P. ; Kwon, Daeyoung ; Wu, Youngsoo
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We have investigated the details of phase separation in the electron-doped manganites Sm1-xCaxMnO3 (0.8≤x≤0.92) by using temperature dependent x-ray diffraction. The lattice of the low-temperature orthorhombic phase is distorted to various extents according to the strength of the coexisting monoclinic phase. Meanwhile, the room-temperature lattice becomes more distorted due to the increasing Jahn–Teller active Mn3+ ions by Sm3+ doping. On the other hand, the substitution of Ca2+ with Sm3+ introduces the Mn3+Mn4+ pairs, which favor the double exchange ferromagnetism. As a result of the competition between the lattice distortion and electron doping level, the modified phase diagram have been presented, including the high-temperature Griffiths phase and the ground state with competing multiphases.

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Journal of Applied Physics  (Volume:105 ,  Issue: 9 )