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Control of Coexisting Ferroelectric Phases in RMnO3 Crystals with Fine Tuning of 4f Moment
Tomoya Tadokoro,Naoaki Kano,Haruhiko Kuroe,Tomoyuki Sekine,Hideki Kuwahara,Mitsuru Akaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have systematically investigated the magnetic and the dielectric properties of Eu0.595(Y1−xHox)0.405MnO3 (0 ≤ x ≤ 1) single crystals with fine tunning of 4f magnetic momentswhile keeping the average size of the rare-earth (R) site the same. In the x = 0.3 crystal,the ferroelectric polarization along the c axis (Pc) emerges at 25 K; then, Pc is suppressed, andPa appears simultaneously with decreasing temperature. On further decreasing temperature, Padisappears and Pc appears again. The observed reentrant behavior of the Pc phase indicates thatthe Pa and the Pc phases are strongly competing with each other.