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Thermal, Dielectric, and Magnetic Properties in Multiferroic Cu2.85Zn0.15Mo2O9
Haruhiko Kuroe,Kento Aoki,Ryusuke Itoh,Tomohiro Hosaka,Takuya Hasegawa,Suguru Hachiuma,Mitsuru Akaki,Hideki Kuwahara,Tomoyuki Sekine,Masashi Hase,Kunihiko Oka,Toshimitsu Ito,Hiroshi Eisaki 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We study the effects of Zn substitution on single crystals of the low-dimensional multiferroicmaterial Cu3Mo2O9. We report the magnetic field-temperature phase diagram obtained from thetemperature and the magnetic field dependences of the specific heat, the dielectric constant, thedifferential magnetization, and the electric polarization-electric field curve in Cu2.85Zn0.15Mo2O9. We obtain three phases: a paraelectric and a ferroelectric phase, and a ferroelectric phase with alarge coercive electric field. The origin of the last one is discussed based on the charge redistributioneffect on a half-filled Mott insulator. In this phase, the Zn substitution induces a robust localizedferroelectric polarization that increases the coercive electric field.
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.