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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.
Anisotropic Magnetic Properties in Åkermanite Sr2MSi2O7 (M=Co, Mn) Crystals
Mitsuru Akaki,Tomoya Tadokoro,Hideki Kuwahara,Takumi Kihara,Masashi Tokunaga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have investigated the magnetic and the dielectric properties of °akermanite Sr2CoSi2O7 and Sr2MnSi2O7 single crystals. Sr2CoSi2O7 shows a canted antiferromagnetism with a large magnetic anisotropy at temperatures below 7 K. By applying a magnetic field along the [110] direction, an electric polarization emerges along the c axis at temperatures below the magnetic transition temperature. In high magnetic fields, the saturation magnetization becomes enhanced only when the electric polarization appears. In contrast, the magnetization of Sr2MnSi2O7 is isotropic at all temperatures, and its magnetic-field-induced electric polarization is very small. These results suggest that the electronic configuration of the transition-metal ion is of crucial importance for the appearance of electric polarization.